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Finding the Fourth Proportional to 72,168.90, 108,320.85 and 36,655.62

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Solution

The fourth proportional to 72,168.90, 108,320.85 and 36,655.62 is: 55,017.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,168.90 : 108,320.85 = 36,655.62 : x
  2. Step 2: Convert to fraction form
    72,168.90/108,320.85 = 36,655.62/x
  3. Step 3: Cross multiply
    72,168.90x = 108,320.85 × 36,655.62
  4. Step 4: Simplify right side
    72,168.90x = 3,970,567,915.68
  5. Step 5: Solve for x
    x = 3,970,567,915.68/72,168.90
  6. Step 6: Final answer
    x = 55,017.71

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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.