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Finding the Fourth Proportional to 407,639.20, 611,545.20 and 123,306.40

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Solution

The fourth proportional to 407,639.20, 611,545.20 and 123,306.40 is: 184,985.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    407,639.20 : 611,545.20 = 123,306.40 : x
  2. Step 2: Convert to fraction form
    407,639.20/611,545.20 = 123,306.40/x
  3. Step 3: Cross multiply
    407,639.20x = 611,545.20 × 123,306.40
  4. Step 4: Simplify right side
    407,639.20x = 75,407,437,049.28
  5. Step 5: Solve for x
    x = 75,407,437,049.28/407,639.20
  6. Step 6: Final answer
    x = 184,985.74

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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.