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Finding the Fourth Proportional to 659,442.60, 989,163.90 and 578,086.20

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Solution

The fourth proportional to 659,442.60, 989,163.90 and 578,086.20 is: 867,129.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,442.60 : 989,163.90 = 578,086.20 : x
  2. Step 2: Convert to fraction form
    659,442.60/989,163.90 = 578,086.20/x
  3. Step 3: Cross multiply
    659,442.60x = 989,163.90 × 578,086.20
  4. Step 4: Simplify right side
    659,442.60x = 571,822,000,128.18
  5. Step 5: Solve for x
    x = 571,822,000,128.18/659,442.60
  6. Step 6: Final answer
    x = 867,129.30

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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.