Home / 21,151.30-29,129.61-20,692.12

Finding the Fourth Proportional to 21,151.30, 29,129.61 and 20,692.12

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Solution

The fourth proportional to 21,151.30, 29,129.61 and 20,692.12 is: 28,497.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,151.30 : 29,129.61 = 20,692.12 : x
  2. Step 2: Convert to fraction form
    21,151.30/29,129.61 = 20,692.12/x
  3. Step 3: Cross multiply
    21,151.30x = 29,129.61 × 20,692.12
  4. Step 4: Simplify right side
    21,151.30x = 602,753,385.67
  5. Step 5: Solve for x
    x = 602,753,385.67/21,151.30
  6. Step 6: Final answer
    x = 28,497.23

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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.