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Finding the Fourth Proportional to 91,137.80, 136,725.90 and 38,520.20

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Solution

The fourth proportional to 91,137.80, 136,725.90 and 38,520.20 is: 57,788.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,137.80 : 136,725.90 = 38,520.20 : x
  2. Step 2: Convert to fraction form
    91,137.80/136,725.90 = 38,520.20/x
  3. Step 3: Cross multiply
    91,137.80x = 136,725.90 × 38,520.20
  4. Step 4: Simplify right side
    91,137.80x = 5,266,709,013.18
  5. Step 5: Solve for x
    x = 5,266,709,013.18/91,137.80
  6. Step 6: Final answer
    x = 57,788.42

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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.