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Finding the Fourth Proportional to 920.24, 1,380.72 and 343.52

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Solution

The fourth proportional to 920.24, 1,380.72 and 343.52 is: 515.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.24 : 1,380.72 = 343.52 : x
  2. Step 2: Convert to fraction form
    920.24/1,380.72 = 343.52/x
  3. Step 3: Cross multiply
    920.24x = 1,380.72 × 343.52
  4. Step 4: Simplify right side
    920.24x = 474,304.93
  5. Step 5: Solve for x
    x = 474,304.93/920.24
  6. Step 6: Final answer
    x = 515.41

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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.