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Finding the Fourth Proportional to 72,290.67, 99,761.11 and 40,459.57

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Solution

The fourth proportional to 72,290.67, 99,761.11 and 40,459.57 is: 55,834.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,290.67 : 99,761.11 = 40,459.57 : x
  2. Step 2: Convert to fraction form
    72,290.67/99,761.11 = 40,459.57/x
  3. Step 3: Cross multiply
    72,290.67x = 99,761.11 × 40,459.57
  4. Step 4: Simplify right side
    72,290.67x = 4,036,291,613.32
  5. Step 5: Solve for x
    x = 4,036,291,613.32/72,290.67
  6. Step 6: Final answer
    x = 55,834.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.