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Finding the Fourth Proportional to 319.58, 479.12 and 157.17

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Solution

The fourth proportional to 319.58, 479.12 and 157.17 is: 235.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.58 : 479.12 = 157.17 : x
  2. Step 2: Convert to fraction form
    319.58/479.12 = 157.17/x
  3. Step 3: Cross multiply
    319.58x = 479.12 × 157.17
  4. Step 4: Simplify right side
    319.58x = 75,304.30
  5. Step 5: Solve for x
    x = 75,304.30/319.58
  6. Step 6: Final answer
    x = 235.64

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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.