Home / 21,005.89-28,990.17-15,691.48

Finding the Fourth Proportional to 21,005.89, 28,990.17 and 15,691.48

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Solution

The fourth proportional to 21,005.89, 28,990.17 and 15,691.48 is: 21,655.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.89 : 28,990.17 = 15,691.48 : x
  2. Step 2: Convert to fraction form
    21,005.89/28,990.17 = 15,691.48/x
  3. Step 3: Cross multiply
    21,005.89x = 28,990.17 × 15,691.48
  4. Step 4: Simplify right side
    21,005.89x = 454,898,672.75
  5. Step 5: Solve for x
    x = 454,898,672.75/21,005.89
  6. Step 6: Final answer
    x = 21,655.77

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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.