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Finding the Fourth Proportional to 8,620.76, 12,931.78 and 2,781.56

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Solution

The fourth proportional to 8,620.76, 12,931.78 and 2,781.56 is: 4,172.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,620.76 : 12,931.78 = 2,781.56 : x
  2. Step 2: Convert to fraction form
    8,620.76/12,931.78 = 2,781.56/x
  3. Step 3: Cross multiply
    8,620.76x = 12,931.78 × 2,781.56
  4. Step 4: Simplify right side
    8,620.76x = 35,970,521.98
  5. Step 5: Solve for x
    x = 35,970,521.98/8,620.76
  6. Step 6: Final answer
    x = 4,172.55

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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.