Home / 12,781.68-19,175.70-12,569.78

Finding the Fourth Proportional to 12,781.68, 19,175.70 and 12,569.78

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Solution

The fourth proportional to 12,781.68, 19,175.70 and 12,569.78 is: 18,857.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,781.68 : 19,175.70 = 12,569.78 : x
  2. Step 2: Convert to fraction form
    12,781.68/19,175.70 = 12,569.78/x
  3. Step 3: Cross multiply
    12,781.68x = 19,175.70 × 12,569.78
  4. Step 4: Simplify right side
    12,781.68x = 241,034,234.47
  5. Step 5: Solve for x
    x = 241,034,234.47/12,781.68
  6. Step 6: Final answer
    x = 18,857.79

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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.