Home / 21,781.38-30,061.35-13,282.59

Finding the Fourth Proportional to 21,781.38, 30,061.35 and 13,282.59

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Solution

The fourth proportional to 21,781.38, 30,061.35 and 13,282.59 is: 18,331.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,781.38 : 30,061.35 = 13,282.59 : x
  2. Step 2: Convert to fraction form
    21,781.38/30,061.35 = 13,282.59/x
  3. Step 3: Cross multiply
    21,781.38x = 30,061.35 × 13,282.59
  4. Step 4: Simplify right side
    21,781.38x = 399,292,586.90
  5. Step 5: Solve for x
    x = 399,292,586.90/21,781.38
  6. Step 6: Final answer
    x = 18,331.83

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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.