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Finding the Fourth Proportional to 72,372.80, 108,559.20 and 65,115.20

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Solution

The fourth proportional to 72,372.80, 108,559.20 and 65,115.20 is: 97,672.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,372.80 : 108,559.20 = 65,115.20 : x
  2. Step 2: Convert to fraction form
    72,372.80/108,559.20 = 65,115.20/x
  3. Step 3: Cross multiply
    72,372.80x = 108,559.20 × 65,115.20
  4. Step 4: Simplify right side
    72,372.80x = 7,068,854,019.84
  5. Step 5: Solve for x
    x = 7,068,854,019.84/72,372.80
  6. Step 6: Final answer
    x = 97,672.80

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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.