Home / 21,385.28-29,521.50-15,720.06

Finding the Fourth Proportional to 21,385.28, 29,521.50 and 15,720.06

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Solution

The fourth proportional to 21,385.28, 29,521.50 and 15,720.06 is: 21,700.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,385.28 : 29,521.50 = 15,720.06 : x
  2. Step 2: Convert to fraction form
    21,385.28/29,521.50 = 15,720.06/x
  3. Step 3: Cross multiply
    21,385.28x = 29,521.50 × 15,720.06
  4. Step 4: Simplify right side
    21,385.28x = 464,079,751.29
  5. Step 5: Solve for x
    x = 464,079,751.29/21,385.28
  6. Step 6: Final answer
    x = 21,700.90

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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.