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Finding the Fourth Proportional to 631.79, 871.94 and 369.80

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Solution

The fourth proportional to 631.79, 871.94 and 369.80 is: 510.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.79 : 871.94 = 369.80 : x
  2. Step 2: Convert to fraction form
    631.79/871.94 = 369.80/x
  3. Step 3: Cross multiply
    631.79x = 871.94 × 369.80
  4. Step 4: Simplify right side
    631.79x = 322,437.20
  5. Step 5: Solve for x
    x = 322,437.20/631.79
  6. Step 6: Final answer
    x = 510.36

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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.