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Finding the Fourth Proportional to 644,439.20, 966,658.80 and 404,938.40

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Solution

The fourth proportional to 644,439.20, 966,658.80 and 404,938.40 is: 607,407.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,439.20 : 966,658.80 = 404,938.40 : x
  2. Step 2: Convert to fraction form
    644,439.20/966,658.80 = 404,938.40/x
  3. Step 3: Cross multiply
    644,439.20x = 966,658.80 × 404,938.40
  4. Step 4: Simplify right side
    644,439.20x = 391,437,267,817.92
  5. Step 5: Solve for x
    x = 391,437,267,817.92/644,439.20
  6. Step 6: Final answer
    x = 607,407.60

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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.