Home / 21,781.95-32,685.36-18,128.43

Finding the Fourth Proportional to 21,781.95, 32,685.36 and 18,128.43

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Solution

The fourth proportional to 21,781.95, 32,685.36 and 18,128.43 is: 27,202.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,781.95 : 32,685.36 = 18,128.43 : x
  2. Step 2: Convert to fraction form
    21,781.95/32,685.36 = 18,128.43/x
  3. Step 3: Cross multiply
    21,781.95x = 32,685.36 × 18,128.43
  4. Step 4: Simplify right side
    21,781.95x = 592,534,260.78
  5. Step 5: Solve for x
    x = 592,534,260.78/21,781.95
  6. Step 6: Final answer
    x = 27,202.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.