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Finding the Fourth Proportional to 319.47, 479.31 and 157.24

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Solution

The fourth proportional to 319.47, 479.31 and 157.24 is: 235.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.47 : 479.31 = 157.24 : x
  2. Step 2: Convert to fraction form
    319.47/479.31 = 157.24/x
  3. Step 3: Cross multiply
    319.47x = 479.31 × 157.24
  4. Step 4: Simplify right side
    319.47x = 75,366.70
  5. Step 5: Solve for x
    x = 75,366.70/319.47
  6. Step 6: Final answer
    x = 235.91

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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.