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Finding the Fourth Proportional to 91,638.92, 137,479.91 and 28,455.78

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Solution

The fourth proportional to 91,638.92, 137,479.91 and 28,455.78 is: 42,690.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,638.92 : 137,479.91 = 28,455.78 : x
  2. Step 2: Convert to fraction form
    91,638.92/137,479.91 = 28,455.78/x
  3. Step 3: Cross multiply
    91,638.92x = 137,479.91 × 28,455.78
  4. Step 4: Simplify right side
    91,638.92x = 3,912,098,446.65
  5. Step 5: Solve for x
    x = 3,912,098,446.65/91,638.92
  6. Step 6: Final answer
    x = 42,690.36

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1.5x scale

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.