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Finding the Fourth Proportional to 15,125.82, 20,868.08 and 9,155.30

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Solution

The fourth proportional to 15,125.82, 20,868.08 and 9,155.30 is: 12,630.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,125.82 : 20,868.08 = 9,155.30 : x
  2. Step 2: Convert to fraction form
    15,125.82/20,868.08 = 9,155.30/x
  3. Step 3: Cross multiply
    15,125.82x = 20,868.08 × 9,155.30
  4. Step 4: Simplify right side
    15,125.82x = 191,053,532.82
  5. Step 5: Solve for x
    x = 191,053,532.82/15,125.82
  6. Step 6: Final answer
    x = 12,630.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.