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Finding the Fourth Proportional to 8,478.58, 12,718 and 2,239.23

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Solution

The fourth proportional to 8,478.58, 12,718 and 2,239.23 is: 3,358.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,478.58 : 12,718 = 2,239.23 : x
  2. Step 2: Convert to fraction form
    8,478.58/12,718 = 2,239.23/x
  3. Step 3: Cross multiply
    8,478.58x = 12,718 × 2,239.23
  4. Step 4: Simplify right side
    8,478.58x = 28,478,527.14
  5. Step 5: Solve for x
    x = 28,478,527.14/8,478.58
  6. Step 6: Final answer
    x = 3,358.88

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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.