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Finding the Fourth Proportional to 1,123.27, 1,549.94 and 871.36

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Solution

The fourth proportional to 1,123.27, 1,549.94 and 871.36 is: 1,202.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.27 : 1,549.94 = 871.36 : x
  2. Step 2: Convert to fraction form
    1,123.27/1,549.94 = 871.36/x
  3. Step 3: Cross multiply
    1,123.27x = 1,549.94 × 871.36
  4. Step 4: Simplify right side
    1,123.27x = 1,350,547.49
  5. Step 5: Solve for x
    x = 1,350,547.49/1,123.27
  6. Step 6: Final answer
    x = 1,202.34

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1.5x scale

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.