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Finding the Fourth Proportional to 1,442.17, 1,989.45 and 851.68

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Solution

The fourth proportional to 1,442.17, 1,989.45 and 851.68 is: 1,174.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.17 : 1,989.45 = 851.68 : x
  2. Step 2: Convert to fraction form
    1,442.17/1,989.45 = 851.68/x
  3. Step 3: Cross multiply
    1,442.17x = 1,989.45 × 851.68
  4. Step 4: Simplify right side
    1,442.17x = 1,694,369.80
  5. Step 5: Solve for x
    x = 1,694,369.80/1,442.17
  6. Step 6: Final answer
    x = 1,174.88

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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.