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Finding the Fourth Proportional to 72,430.65, 108,645.98 and 66,209.85

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Solution

The fourth proportional to 72,430.65, 108,645.98 and 66,209.85 is: 99,314.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,430.65 : 108,645.98 = 66,209.85 : x
  2. Step 2: Convert to fraction form
    72,430.65/108,645.98 = 66,209.85/x
  3. Step 3: Cross multiply
    72,430.65x = 108,645.98 × 66,209.85
  4. Step 4: Simplify right side
    72,430.65x = 7,193,433,707.85
  5. Step 5: Solve for x
    x = 7,193,433,707.85/72,430.65
  6. Step 6: Final answer
    x = 99,314.78

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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.