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Finding the Fourth Proportional to 1,239.28, 1,857.02 and 1,123.18

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Solution

The fourth proportional to 1,239.28, 1,857.02 and 1,123.18 is: 1,683.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.28 : 1,857.02 = 1,123.18 : x
  2. Step 2: Convert to fraction form
    1,239.28/1,857.02 = 1,123.18/x
  3. Step 3: Cross multiply
    1,239.28x = 1,857.02 × 1,123.18
  4. Step 4: Simplify right side
    1,239.28x = 2,085,767.72
  5. Step 5: Solve for x
    x = 2,085,767.72/1,239.28
  6. Step 6: Final answer
    x = 1,683.05

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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.