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Finding the Fourth Proportional to 578,446.40, 867,669.60 and 389,489.60

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Solution

The fourth proportional to 578,446.40, 867,669.60 and 389,489.60 is: 584,234.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,446.40 : 867,669.60 = 389,489.60 : x
  2. Step 2: Convert to fraction form
    578,446.40/867,669.60 = 389,489.60/x
  3. Step 3: Cross multiply
    578,446.40x = 867,669.60 × 389,489.60
  4. Step 4: Simplify right side
    578,446.40x = 337,948,285,436.16
  5. Step 5: Solve for x
    x = 337,948,285,436.16/578,446.40
  6. Step 6: Final answer
    x = 584,234.40

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.