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Finding the Fourth Proportional to 928.05, 1,391.92 and 343.32

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Solution

The fourth proportional to 928.05, 1,391.92 and 343.32 is: 514.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.05 : 1,391.92 = 343.32 : x
  2. Step 2: Convert to fraction form
    928.05/1,391.92 = 343.32/x
  3. Step 3: Cross multiply
    928.05x = 1,391.92 × 343.32
  4. Step 4: Simplify right side
    928.05x = 477,875.74
  5. Step 5: Solve for x
    x = 477,875.74/928.05
  6. Step 6: Final answer
    x = 514.93

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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.