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Finding the Fourth Proportional to 62,978.16, 86,951.68 and 39,140.40

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Solution

The fourth proportional to 62,978.16, 86,951.68 and 39,140.40 is: 54,039.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    62,978.16 : 86,951.68 = 39,140.40 : x
  2. Step 2: Convert to fraction form
    62,978.16/86,951.68 = 39,140.40/x
  3. Step 3: Cross multiply
    62,978.16x = 86,951.68 × 39,140.40
  4. Step 4: Simplify right side
    62,978.16x = 3,403,323,535.87
  5. Step 5: Solve for x
    x = 3,403,323,535.87/62,978.16
  6. Step 6: Final answer
    x = 54,039.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.