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Finding the Fourth Proportional to 631.31, 871.21 and 369.33

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Solution

The fourth proportional to 631.31, 871.21 and 369.33 is: 509.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.31 : 871.21 = 369.33 : x
  2. Step 2: Convert to fraction form
    631.31/871.21 = 369.33/x
  3. Step 3: Cross multiply
    631.31x = 871.21 × 369.33
  4. Step 4: Simplify right side
    631.31x = 321,763.99
  5. Step 5: Solve for x
    x = 321,763.99/631.31
  6. Step 6: Final answer
    x = 509.68

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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.