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Finding the Fourth Proportional to 8,959.28, 12,346.43 and 8,815.91

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Solution

The fourth proportional to 8,959.28, 12,346.43 and 8,815.91 is: 12,148.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,959.28 : 12,346.43 = 8,815.91 : x
  2. Step 2: Convert to fraction form
    8,959.28/12,346.43 = 8,815.91/x
  3. Step 3: Cross multiply
    8,959.28x = 12,346.43 × 8,815.91
  4. Step 4: Simplify right side
    8,959.28x = 108,844,909.89
  5. Step 5: Solve for x
    x = 108,844,909.89/8,959.28
  6. Step 6: Final answer
    x = 12,148.85

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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.