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Finding the Fourth Proportional to 928.12, 1,391.66 and 311.48

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Solution

The fourth proportional to 928.12, 1,391.66 and 311.48 is: 467.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.12 : 1,391.66 = 311.48 : x
  2. Step 2: Convert to fraction form
    928.12/1,391.66 = 311.48/x
  3. Step 3: Cross multiply
    928.12x = 1,391.66 × 311.48
  4. Step 4: Simplify right side
    928.12x = 433,474.26
  5. Step 5: Solve for x
    x = 433,474.26/928.12
  6. Step 6: Final answer
    x = 467.05

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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.