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Finding the Fourth Proportional to 18,565.78, 25,620.78 and 11,113.78

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Solution

The fourth proportional to 18,565.78, 25,620.78 and 11,113.78 is: 15,337.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,565.78 : 25,620.78 = 11,113.78 : x
  2. Step 2: Convert to fraction form
    18,565.78/25,620.78 = 11,113.78/x
  3. Step 3: Cross multiply
    18,565.78x = 25,620.78 × 11,113.78
  4. Step 4: Simplify right side
    18,565.78x = 284,743,712.35
  5. Step 5: Solve for x
    x = 284,743,712.35/18,565.78
  6. Step 6: Final answer
    x = 15,337.02

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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.