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Finding the Fourth Proportional to 17,712.80, 26,540.40 and 14,775.20

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Solution

The fourth proportional to 17,712.80, 26,540.40 and 14,775.20 is: 22,138.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,712.80 : 26,540.40 = 14,775.20 : x
  2. Step 2: Convert to fraction form
    17,712.80/26,540.40 = 14,775.20/x
  3. Step 3: Cross multiply
    17,712.80x = 26,540.40 × 14,775.20
  4. Step 4: Simplify right side
    17,712.80x = 392,139,718.08
  5. Step 5: Solve for x
    x = 392,139,718.08/17,712.80
  6. Step 6: Final answer
    x = 22,138.78

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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.