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Finding the Fourth Proportional to 1,123.14, 1,683.15 and 661.22

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Solution

The fourth proportional to 1,123.14, 1,683.15 and 661.22 is: 990.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.14 : 1,683.15 = 661.22 : x
  2. Step 2: Convert to fraction form
    1,123.14/1,683.15 = 661.22/x
  3. Step 3: Cross multiply
    1,123.14x = 1,683.15 × 661.22
  4. Step 4: Simplify right side
    1,123.14x = 1,112,932.44
  5. Step 5: Solve for x
    x = 1,112,932.44/1,123.14
  6. Step 6: Final answer
    x = 990.91

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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.