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Finding the Fourth Proportional to 631.69, 871.72 and 351.95

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Solution

The fourth proportional to 631.69, 871.72 and 351.95 is: 485.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.69 : 871.72 = 351.95 : x
  2. Step 2: Convert to fraction form
    631.69/871.72 = 351.95/x
  3. Step 3: Cross multiply
    631.69x = 871.72 × 351.95
  4. Step 4: Simplify right side
    631.69x = 306,805.95
  5. Step 5: Solve for x
    x = 306,805.95/631.69
  6. Step 6: Final answer
    x = 485.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.