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Finding the Fourth Proportional to 8,639.18, 12,965.69 and 4,480.38

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Solution

The fourth proportional to 8,639.18, 12,965.69 and 4,480.38 is: 6,724.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,639.18 : 12,965.69 = 4,480.38 : x
  2. Step 2: Convert to fraction form
    8,639.18/12,965.69 = 4,480.38/x
  3. Step 3: Cross multiply
    8,639.18x = 12,965.69 × 4,480.38
  4. Step 4: Simplify right side
    8,639.18x = 58,091,218.16
  5. Step 5: Solve for x
    x = 58,091,218.16/8,639.18
  6. Step 6: Final answer
    x = 6,724.16

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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.