Home / 21,123.06-29,148.24-11,691.78

Finding the Fourth Proportional to 21,123.06, 29,148.24 and 11,691.78

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Solution

The fourth proportional to 21,123.06, 29,148.24 and 11,691.78 is: 16,133.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,123.06 : 29,148.24 = 11,691.78 : x
  2. Step 2: Convert to fraction form
    21,123.06/29,148.24 = 11,691.78/x
  3. Step 3: Cross multiply
    21,123.06x = 29,148.24 × 11,691.78
  4. Step 4: Simplify right side
    21,123.06x = 340,794,809.47
  5. Step 5: Solve for x
    x = 340,794,809.47/21,123.06
  6. Step 6: Final answer
    x = 16,133.78

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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.