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Finding the Fourth Proportional to 78,987.38, 118,375.95 and 38,945.24

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Solution

The fourth proportional to 78,987.38, 118,375.95 and 38,945.24 is: 58,366.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,987.38 : 118,375.95 = 38,945.24 : x
  2. Step 2: Convert to fraction form
    78,987.38/118,375.95 = 38,945.24/x
  3. Step 3: Cross multiply
    78,987.38x = 118,375.95 × 38,945.24
  4. Step 4: Simplify right side
    78,987.38x = 4,610,179,782.98
  5. Step 5: Solve for x
    x = 4,610,179,782.98/78,987.38
  6. Step 6: Final answer
    x = 58,366.03

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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.