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Finding the Fourth Proportional to 18,753.31, 28,105.36 and 13,799.76

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Solution

The fourth proportional to 18,753.31, 28,105.36 and 13,799.76 is: 20,681.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,753.31 : 28,105.36 = 13,799.76 : x
  2. Step 2: Convert to fraction form
    18,753.31/28,105.36 = 13,799.76/x
  3. Step 3: Cross multiply
    18,753.31x = 28,105.36 × 13,799.76
  4. Step 4: Simplify right side
    18,753.31x = 387,847,222.71
  5. Step 5: Solve for x
    x = 387,847,222.71/18,753.31
  6. Step 6: Final answer
    x = 20,681.53

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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.