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Finding the Fourth Proportional to 939.20, 1,401.98 and 871.56

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Solution

The fourth proportional to 939.20, 1,401.98 and 871.56 is: 1,301.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.20 : 1,401.98 = 871.56 : x
  2. Step 2: Convert to fraction form
    939.20/1,401.98 = 871.56/x
  3. Step 3: Cross multiply
    939.20x = 1,401.98 × 871.56
  4. Step 4: Simplify right side
    939.20x = 1,221,905.33
  5. Step 5: Solve for x
    x = 1,221,905.33/939.20
  6. Step 6: Final answer
    x = 1,301.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.