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Finding the Fourth Proportional to 353.88, 531.36 and 315.72

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Solution

The fourth proportional to 353.88, 531.36 and 315.72 is: 474.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.88 : 531.36 = 315.72 : x
  2. Step 2: Convert to fraction form
    353.88/531.36 = 315.72/x
  3. Step 3: Cross multiply
    353.88x = 531.36 × 315.72
  4. Step 4: Simplify right side
    353.88x = 167,760.98
  5. Step 5: Solve for x
    x = 167,760.98/353.88
  6. Step 6: Final answer
    x = 474.06

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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.