Home / 20,918.76-28,839.96-17,921.76

Finding the Fourth Proportional to 20,918.76, 28,839.96 and 17,921.76

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Solution

The fourth proportional to 20,918.76, 28,839.96 and 17,921.76 is: 24,708.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.76 : 28,839.96 = 17,921.76 : x
  2. Step 2: Convert to fraction form
    20,918.76/28,839.96 = 17,921.76/x
  3. Step 3: Cross multiply
    20,918.76x = 28,839.96 × 17,921.76
  4. Step 4: Simplify right side
    20,918.76x = 516,862,841.53
  5. Step 5: Solve for x
    x = 516,862,841.53/20,918.76
  6. Step 6: Final answer
    x = 24,708.10

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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.