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Finding the Fourth Proportional to 1,393.76, 2,091.11 and 571.61

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Solution

The fourth proportional to 1,393.76, 2,091.11 and 571.61 is: 857.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.76 : 2,091.11 = 571.61 : x
  2. Step 2: Convert to fraction form
    1,393.76/2,091.11 = 571.61/x
  3. Step 3: Cross multiply
    1,393.76x = 2,091.11 × 571.61
  4. Step 4: Simplify right side
    1,393.76x = 1,195,286.07
  5. Step 5: Solve for x
    x = 1,195,286.07/1,393.76
  6. Step 6: Final answer
    x = 857.60

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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.