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Finding the Fourth Proportional to 9,138.60, 13,707.90 and 2,565.90

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Solution

The fourth proportional to 9,138.60, 13,707.90 and 2,565.90 is: 3,848.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,138.60 : 13,707.90 = 2,565.90 : x
  2. Step 2: Convert to fraction form
    9,138.60/13,707.90 = 2,565.90/x
  3. Step 3: Cross multiply
    9,138.60x = 13,707.90 × 2,565.90
  4. Step 4: Simplify right side
    9,138.60x = 35,173,100.61
  5. Step 5: Solve for x
    x = 35,173,100.61/9,138.60
  6. Step 6: Final answer
    x = 3,848.85

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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.