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Finding the Fourth Proportional to 9,874.12, 13,609.20 and 8,607.28

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Solution

The fourth proportional to 9,874.12, 13,609.20 and 8,607.28 is: 11,863.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,874.12 : 13,609.20 = 8,607.28 : x
  2. Step 2: Convert to fraction form
    9,874.12/13,609.20 = 8,607.28/x
  3. Step 3: Cross multiply
    9,874.12x = 13,609.20 × 8,607.28
  4. Step 4: Simplify right side
    9,874.12x = 117,138,194.98
  5. Step 5: Solve for x
    x = 117,138,194.98/9,874.12
  6. Step 6: Final answer
    x = 11,863.15

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1.5x scale

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.