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Finding the Fourth Proportional to 415,811.60, 623,717.40 and 386,320.40

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Solution

The fourth proportional to 415,811.60, 623,717.40 and 386,320.40 is: 579,480.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,811.60 : 623,717.40 = 386,320.40 : x
  2. Step 2: Convert to fraction form
    415,811.60/623,717.40 = 386,320.40/x
  3. Step 3: Cross multiply
    415,811.60x = 623,717.40 × 386,320.40
  4. Step 4: Simplify right side
    415,811.60x = 240,954,755,454.96
  5. Step 5: Solve for x
    x = 240,954,755,454.96/415,811.60
  6. Step 6: Final answer
    x = 579,480.60

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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.