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Finding the Fourth Proportional to 928.05, 1,391.61 and 311.54

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Solution

The fourth proportional to 928.05, 1,391.61 and 311.54 is: 467.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.05 : 1,391.61 = 311.54 : x
  2. Step 2: Convert to fraction form
    928.05/1,391.61 = 311.54/x
  3. Step 3: Cross multiply
    928.05x = 1,391.61 × 311.54
  4. Step 4: Simplify right side
    928.05x = 433,542.18
  5. Step 5: Solve for x
    x = 433,542.18/928.05
  6. Step 6: Final answer
    x = 467.15

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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.