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Finding the Fourth Proportional to 731.20, 1,097.36 and 346.72

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Solution

The fourth proportional to 731.20, 1,097.36 and 346.72 is: 520.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.20 : 1,097.36 = 346.72 : x
  2. Step 2: Convert to fraction form
    731.20/1,097.36 = 346.72/x
  3. Step 3: Cross multiply
    731.20x = 1,097.36 × 346.72
  4. Step 4: Simplify right side
    731.20x = 380,476.66
  5. Step 5: Solve for x
    x = 380,476.66/731.20
  6. Step 6: Final answer
    x = 520.35

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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.