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Finding the Fourth Proportional to 18,209.97, 25,117.17 and 11,139.90

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Solution

The fourth proportional to 18,209.97, 25,117.17 and 11,139.90 is: 15,365.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,209.97 : 25,117.17 = 11,139.90 : x
  2. Step 2: Convert to fraction form
    18,209.97/25,117.17 = 11,139.90/x
  3. Step 3: Cross multiply
    18,209.97x = 25,117.17 × 11,139.90
  4. Step 4: Simplify right side
    18,209.97x = 279,802,762.08
  5. Step 5: Solve for x
    x = 279,802,762.08/18,209.97
  6. Step 6: Final answer
    x = 15,365.36

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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.