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Finding the Fourth Proportional to 1,122.68, 1,683.86 and 392.19

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Solution

The fourth proportional to 1,122.68, 1,683.86 and 392.19 is: 588.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.68 : 1,683.86 = 392.19 : x
  2. Step 2: Convert to fraction form
    1,122.68/1,683.86 = 392.19/x
  3. Step 3: Cross multiply
    1,122.68x = 1,683.86 × 392.19
  4. Step 4: Simplify right side
    1,122.68x = 660,391.09
  5. Step 5: Solve for x
    x = 660,391.09/1,122.68
  6. Step 6: Final answer
    x = 588.23

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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.