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Finding the Fourth Proportional to 8,938.62, 12,342.87 and 6,291.90

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Solution

The fourth proportional to 8,938.62, 12,342.87 and 6,291.90 is: 8,688.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,938.62 : 12,342.87 = 6,291.90 : x
  2. Step 2: Convert to fraction form
    8,938.62/12,342.87 = 6,291.90/x
  3. Step 3: Cross multiply
    8,938.62x = 12,342.87 × 6,291.90
  4. Step 4: Simplify right side
    8,938.62x = 77,660,103.75
  5. Step 5: Solve for x
    x = 77,660,103.75/8,938.62
  6. Step 6: Final answer
    x = 8,688.15

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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.