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Finding the Fourth Proportional to 285,938.47, 428,910.78 and 86,260.59

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Solution

The fourth proportional to 285,938.47, 428,910.78 and 86,260.59 is: 129,391.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,938.47 : 428,910.78 = 86,260.59 : x
  2. Step 2: Convert to fraction form
    285,938.47/428,910.78 = 86,260.59/x
  3. Step 3: Cross multiply
    285,938.47x = 428,910.78 × 86,260.59
  4. Step 4: Simplify right side
    285,938.47x = 36,998,096,940.16
  5. Step 5: Solve for x
    x = 36,998,096,940.16/285,938.47
  6. Step 6: Final answer
    x = 129,391.81

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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.