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Finding the Fourth Proportional to 91,478.80, 137,218.20 and 38,870.80

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Solution

The fourth proportional to 91,478.80, 137,218.20 and 38,870.80 is: 58,306.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,478.80 : 137,218.20 = 38,870.80 : x
  2. Step 2: Convert to fraction form
    91,478.80/137,218.20 = 38,870.80/x
  3. Step 3: Cross multiply
    91,478.80x = 137,218.20 × 38,870.80
  4. Step 4: Simplify right side
    91,478.80x = 5,333,781,208.56
  5. Step 5: Solve for x
    x = 5,333,781,208.56/91,478.80
  6. Step 6: Final answer
    x = 58,306.20

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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.