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Finding the Fourth Proportional to 8,610.80, 12,909.20 and 3,061.08

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Solution

The fourth proportional to 8,610.80, 12,909.20 and 3,061.08 is: 4,589.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,610.80 : 12,909.20 = 3,061.08 : x
  2. Step 2: Convert to fraction form
    8,610.80/12,909.20 = 3,061.08/x
  3. Step 3: Cross multiply
    8,610.80x = 12,909.20 × 3,061.08
  4. Step 4: Simplify right side
    8,610.80x = 39,516,078.63
  5. Step 5: Solve for x
    x = 39,516,078.63/8,610.80
  6. Step 6: Final answer
    x = 4,589.13

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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.