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Finding the Fourth Proportional to 13,387, 18,474.54 and 8,080.78

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Solution

The fourth proportional to 13,387, 18,474.54 and 8,080.78 is: 11,151.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,387 : 18,474.54 = 8,080.78 : x
  2. Step 2: Convert to fraction form
    13,387/18,474.54 = 8,080.78/x
  3. Step 3: Cross multiply
    13,387x = 18,474.54 × 8,080.78
  4. Step 4: Simplify right side
    13,387x = 149,288,693.34
  5. Step 5: Solve for x
    x = 149,288,693.34/13,387
  6. Step 6: Final answer
    x = 11,151.77

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Double scale
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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.