Home / 21,086.13-29,120.65-18,239.84

Finding the Fourth Proportional to 21,086.13, 29,120.65 and 18,239.84

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Solution

The fourth proportional to 21,086.13, 29,120.65 and 18,239.84 is: 25,189.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,086.13 : 29,120.65 = 18,239.84 : x
  2. Step 2: Convert to fraction form
    21,086.13/29,120.65 = 18,239.84/x
  3. Step 3: Cross multiply
    21,086.13x = 29,120.65 × 18,239.84
  4. Step 4: Simplify right side
    21,086.13x = 531,156,023.90
  5. Step 5: Solve for x
    x = 531,156,023.90/21,086.13
  6. Step 6: Final answer
    x = 25,189.83

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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.