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Finding the Fourth Proportional to 12,891.18, 17,792.84 and 8,407.13

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Solution

The fourth proportional to 12,891.18, 17,792.84 and 8,407.13 is: 11,603.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.18 : 17,792.84 = 8,407.13 : x
  2. Step 2: Convert to fraction form
    12,891.18/17,792.84 = 8,407.13/x
  3. Step 3: Cross multiply
    12,891.18x = 17,792.84 × 8,407.13
  4. Step 4: Simplify right side
    12,891.18x = 149,586,587.95
  5. Step 5: Solve for x
    x = 149,586,587.95/12,891.18
  6. Step 6: Final answer
    x = 11,603.79

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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.