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Finding the Fourth Proportional to 1,242.73, 1,860.45 and 871.24

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Solution

The fourth proportional to 1,242.73, 1,860.45 and 871.24 is: 1,304.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.73 : 1,860.45 = 871.24 : x
  2. Step 2: Convert to fraction form
    1,242.73/1,860.45 = 871.24/x
  3. Step 3: Cross multiply
    1,242.73x = 1,860.45 × 871.24
  4. Step 4: Simplify right side
    1,242.73x = 1,620,898.46
  5. Step 5: Solve for x
    x = 1,620,898.46/1,242.73
  6. Step 6: Final answer
    x = 1,304.30

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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.