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Finding the Fourth Proportional to 8,639.69, 12,963.17 and 4,257.18

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Solution

The fourth proportional to 8,639.69, 12,963.17 and 4,257.18 is: 6,387.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,639.69 : 12,963.17 = 4,257.18 : x
  2. Step 2: Convert to fraction form
    8,639.69/12,963.17 = 4,257.18/x
  3. Step 3: Cross multiply
    8,639.69x = 12,963.17 × 4,257.18
  4. Step 4: Simplify right side
    8,639.69x = 55,186,526.77
  5. Step 5: Solve for x
    x = 55,186,526.77/8,639.69
  6. Step 6: Final answer
    x = 6,387.56

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1.5x scale

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.