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Finding the Fourth Proportional to 91,379.80, 137,021.10 and 38,729.80

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Solution

The fourth proportional to 91,379.80, 137,021.10 and 38,729.80 is: 58,074.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,379.80 : 137,021.10 = 38,729.80 : x
  2. Step 2: Convert to fraction form
    91,379.80/137,021.10 = 38,729.80/x
  3. Step 3: Cross multiply
    91,379.80x = 137,021.10 × 38,729.80
  4. Step 4: Simplify right side
    91,379.80x = 5,306,799,798.78
  5. Step 5: Solve for x
    x = 5,306,799,798.78/91,379.80
  6. Step 6: Final answer
    x = 58,074.10

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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.