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Finding the Fourth Proportional to 319.80, 479.31 and 316.38

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Solution

The fourth proportional to 319.80, 479.31 and 316.38 is: 474.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.80 : 479.31 = 316.38 : x
  2. Step 2: Convert to fraction form
    319.80/479.31 = 316.38/x
  3. Step 3: Cross multiply
    319.80x = 479.31 × 316.38
  4. Step 4: Simplify right side
    319.80x = 151,644.10
  5. Step 5: Solve for x
    x = 151,644.10/319.80
  6. Step 6: Final answer
    x = 474.18

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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.