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Finding the Fourth Proportional to 578,897.60, 868,346.40 and 389,940.80

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Solution

The fourth proportional to 578,897.60, 868,346.40 and 389,940.80 is: 584,911.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,897.60 : 868,346.40 = 389,940.80 : x
  2. Step 2: Convert to fraction form
    578,897.60/868,346.40 = 389,940.80/x
  3. Step 3: Cross multiply
    578,897.60x = 868,346.40 × 389,940.80
  4. Step 4: Simplify right side
    578,897.60x = 338,603,689,893.12
  5. Step 5: Solve for x
    x = 338,603,689,893.12/578,897.60
  6. Step 6: Final answer
    x = 584,911.20

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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.