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Finding the Fourth Proportional to 20,932.80, 28,912.80 and 15,651

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Solution

The fourth proportional to 20,932.80, 28,912.80 and 15,651 is: 21,617.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,932.80 : 28,912.80 = 15,651 : x
  2. Step 2: Convert to fraction form
    20,932.80/28,912.80 = 15,651/x
  3. Step 3: Cross multiply
    20,932.80x = 28,912.80 × 15,651
  4. Step 4: Simplify right side
    20,932.80x = 452,514,232.80
  5. Step 5: Solve for x
    x = 452,514,232.80/20,932.80
  6. Step 6: Final answer
    x = 21,617.47

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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.