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Finding the Fourth Proportional to 1,201.81, 1,801.47 and 871.92

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Solution

The fourth proportional to 1,201.81, 1,801.47 and 871.92 is: 1,306.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.81 : 1,801.47 = 871.92 : x
  2. Step 2: Convert to fraction form
    1,201.81/1,801.47 = 871.92/x
  3. Step 3: Cross multiply
    1,201.81x = 1,801.47 × 871.92
  4. Step 4: Simplify right side
    1,201.81x = 1,570,747.75
  5. Step 5: Solve for x
    x = 1,570,747.75/1,201.81
  6. Step 6: Final answer
    x = 1,306.99

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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.