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Finding the Fourth Proportional to 12,859.89, 17,754.39 and 8,391.39

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Solution

The fourth proportional to 12,859.89, 17,754.39 and 8,391.39 is: 11,585.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,859.89 : 17,754.39 = 8,391.39 : x
  2. Step 2: Convert to fraction form
    12,859.89/17,754.39 = 8,391.39/x
  3. Step 3: Cross multiply
    12,859.89x = 17,754.39 × 8,391.39
  4. Step 4: Simplify right side
    12,859.89x = 148,984,010.70
  5. Step 5: Solve for x
    x = 148,984,010.70/12,859.89
  6. Step 6: Final answer
    x = 11,585.17

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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.