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Finding the Fourth Proportional to 1,147.20, 1,717.68 and 871.98

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Solution

The fourth proportional to 1,147.20, 1,717.68 and 871.98 is: 1,305.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.20 : 1,717.68 = 871.98 : x
  2. Step 2: Convert to fraction form
    1,147.20/1,717.68 = 871.98/x
  3. Step 3: Cross multiply
    1,147.20x = 1,717.68 × 871.98
  4. Step 4: Simplify right side
    1,147.20x = 1,497,782.61
  5. Step 5: Solve for x
    x = 1,497,782.61/1,147.20
  6. Step 6: Final answer
    x = 1,305.60

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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.