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Finding the Fourth Proportional to 8,687.47, 13,031.21 and 2,113.66

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Solution

The fourth proportional to 8,687.47, 13,031.21 and 2,113.66 is: 3,170.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.47 : 13,031.21 = 2,113.66 : x
  2. Step 2: Convert to fraction form
    8,687.47/13,031.21 = 2,113.66/x
  3. Step 3: Cross multiply
    8,687.47x = 13,031.21 × 2,113.66
  4. Step 4: Simplify right side
    8,687.47x = 27,543,547.33
  5. Step 5: Solve for x
    x = 27,543,547.33/8,687.47
  6. Step 6: Final answer
    x = 3,170.49

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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.