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Finding the Fourth Proportional to 12,781.90, 17,639.22 and 7,192.90

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Solution

The fourth proportional to 12,781.90, 17,639.22 and 7,192.90 is: 9,926.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,781.90 : 17,639.22 = 7,192.90 : x
  2. Step 2: Convert to fraction form
    12,781.90/17,639.22 = 7,192.90/x
  3. Step 3: Cross multiply
    12,781.90x = 17,639.22 × 7,192.90
  4. Step 4: Simplify right side
    12,781.90x = 126,877,145.54
  5. Step 5: Solve for x
    x = 126,877,145.54/12,781.90
  6. Step 6: Final answer
    x = 9,926.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.