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Finding the Fourth Proportional to 8,543.80, 12,815.70 and 7,887.70

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Solution

The fourth proportional to 8,543.80, 12,815.70 and 7,887.70 is: 11,831.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,543.80 : 12,815.70 = 7,887.70 : x
  2. Step 2: Convert to fraction form
    8,543.80/12,815.70 = 7,887.70/x
  3. Step 3: Cross multiply
    8,543.80x = 12,815.70 × 7,887.70
  4. Step 4: Simplify right side
    8,543.80x = 101,086,396.89
  5. Step 5: Solve for x
    x = 101,086,396.89/8,543.80
  6. Step 6: Final answer
    x = 11,831.55

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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.