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Finding the Fourth Proportional to 9,142.80, 13,714.20 and 8,689.20

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Solution

The fourth proportional to 9,142.80, 13,714.20 and 8,689.20 is: 13,033.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,142.80 : 13,714.20 = 8,689.20 : x
  2. Step 2: Convert to fraction form
    9,142.80/13,714.20 = 8,689.20/x
  3. Step 3: Cross multiply
    9,142.80x = 13,714.20 × 8,689.20
  4. Step 4: Simplify right side
    9,142.80x = 119,165,426.64
  5. Step 5: Solve for x
    x = 119,165,426.64/9,142.80
  6. Step 6: Final answer
    x = 13,033.80

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Double scale
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Similar ratio
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1.5x scale

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.