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Finding the Fourth Proportional to 1,121.92, 1,683.65 and 391.50

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Solution

The fourth proportional to 1,121.92, 1,683.65 and 391.50 is: 587.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.92 : 1,683.65 = 391.50 : x
  2. Step 2: Convert to fraction form
    1,121.92/1,683.65 = 391.50/x
  3. Step 3: Cross multiply
    1,121.92x = 1,683.65 × 391.50
  4. Step 4: Simplify right side
    1,121.92x = 659,144.48
  5. Step 5: Solve for x
    x = 659,144.48/1,121.92
  6. Step 6: Final answer
    x = 587.51

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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.