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Finding the Fourth Proportional to 78,686.57, 118,030.71 and 62,991.38

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Solution

The fourth proportional to 78,686.57, 118,030.71 and 62,991.38 is: 94,487.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,686.57 : 118,030.71 = 62,991.38 : x
  2. Step 2: Convert to fraction form
    78,686.57/118,030.71 = 62,991.38/x
  3. Step 3: Cross multiply
    78,686.57x = 118,030.71 × 62,991.38
  4. Step 4: Simplify right side
    78,686.57x = 7,434,917,305.28
  5. Step 5: Solve for x
    x = 7,434,917,305.28/78,686.57
  6. Step 6: Final answer
    x = 94,487.75

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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.