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Finding the Fourth Proportional to 72,375.90, 108,538.25 and 34,420.70

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Solution

The fourth proportional to 72,375.90, 108,538.25 and 34,420.70 is: 51,618.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,375.90 : 108,538.25 = 34,420.70 : x
  2. Step 2: Convert to fraction form
    72,375.90/108,538.25 = 34,420.70/x
  3. Step 3: Cross multiply
    72,375.90x = 108,538.25 × 34,420.70
  4. Step 4: Simplify right side
    72,375.90x = 3,735,962,541.78
  5. Step 5: Solve for x
    x = 3,735,962,541.78/72,375.90
  6. Step 6: Final answer
    x = 51,618.88

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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.