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Finding the Fourth Proportional to 15,123.68, 20,868.71 and 8,407.97

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Solution

The fourth proportional to 15,123.68, 20,868.71 and 8,407.97 is: 11,601.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,123.68 : 20,868.71 = 8,407.97 : x
  2. Step 2: Convert to fraction form
    15,123.68/20,868.71 = 8,407.97/x
  3. Step 3: Cross multiply
    15,123.68x = 20,868.71 × 8,407.97
  4. Step 4: Simplify right side
    15,123.68x = 175,463,419.49
  5. Step 5: Solve for x
    x = 175,463,419.49/15,123.68
  6. Step 6: Final answer
    x = 11,601.90

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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.