Home / 21,211.28-29,272.12-11,780.72

Finding the Fourth Proportional to 21,211.28, 29,272.12 and 11,780.72

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Solution

The fourth proportional to 21,211.28, 29,272.12 and 11,780.72 is: 16,257.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,211.28 : 29,272.12 = 11,780.72 : x
  2. Step 2: Convert to fraction form
    21,211.28/29,272.12 = 11,780.72/x
  3. Step 3: Cross multiply
    21,211.28x = 29,272.12 × 11,780.72
  4. Step 4: Simplify right side
    21,211.28x = 344,846,649.53
  5. Step 5: Solve for x
    x = 344,846,649.53/21,211.28
  6. Step 6: Final answer
    x = 16,257.70

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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.