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Finding the Fourth Proportional to 1,123.36, 1,682.16 and 939.04

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Solution

The fourth proportional to 1,123.36, 1,682.16 and 939.04 is: 1,406.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.36 : 1,682.16 = 939.04 : x
  2. Step 2: Convert to fraction form
    1,123.36/1,682.16 = 939.04/x
  3. Step 3: Cross multiply
    1,123.36x = 1,682.16 × 939.04
  4. Step 4: Simplify right side
    1,123.36x = 1,579,615.53
  5. Step 5: Solve for x
    x = 1,579,615.53/1,123.36
  6. Step 6: Final answer
    x = 1,406.15

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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.