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Finding the Fourth Proportional to 1,122.75, 1,683.90 and 392.36

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Solution

The fourth proportional to 1,122.75, 1,683.90 and 392.36 is: 588.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.75 : 1,683.90 = 392.36 : x
  2. Step 2: Convert to fraction form
    1,122.75/1,683.90 = 392.36/x
  3. Step 3: Cross multiply
    1,122.75x = 1,683.90 × 392.36
  4. Step 4: Simplify right side
    1,122.75x = 660,686.58
  5. Step 5: Solve for x
    x = 660,686.58/1,122.75
  6. Step 6: Final answer
    x = 588.45

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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.