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Finding the Fourth Proportional to 1,122.85, 1,683.79 and 372.15

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Solution

The fourth proportional to 1,122.85, 1,683.79 and 372.15 is: 558.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.85 : 1,683.79 = 372.15 : x
  2. Step 2: Convert to fraction form
    1,122.85/1,683.79 = 372.15/x
  3. Step 3: Cross multiply
    1,122.85x = 1,683.79 × 372.15
  4. Step 4: Simplify right side
    1,122.85x = 626,622.45
  5. Step 5: Solve for x
    x = 626,622.45/1,122.85
  6. Step 6: Final answer
    x = 558.06

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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.