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Finding the Fourth Proportional to 8,618.64, 12,931.04 and 4,239.17

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Solution

The fourth proportional to 8,618.64, 12,931.04 and 4,239.17 is: 6,360.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,618.64 : 12,931.04 = 4,239.17 : x
  2. Step 2: Convert to fraction form
    8,618.64/12,931.04 = 4,239.17/x
  3. Step 3: Cross multiply
    8,618.64x = 12,931.04 × 4,239.17
  4. Step 4: Simplify right side
    8,618.64x = 54,816,876.84
  5. Step 5: Solve for x
    x = 54,816,876.84/8,618.64
  6. Step 6: Final answer
    x = 6,360.27

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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.