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Finding the Fourth Proportional to 320.12, 479.56 and 157.31

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Solution

The fourth proportional to 320.12, 479.56 and 157.31 is: 235.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.12 : 479.56 = 157.31 : x
  2. Step 2: Convert to fraction form
    320.12/479.56 = 157.31/x
  3. Step 3: Cross multiply
    320.12x = 479.56 × 157.31
  4. Step 4: Simplify right side
    320.12x = 75,439.58
  5. Step 5: Solve for x
    x = 75,439.58/320.12
  6. Step 6: Final answer
    x = 235.66

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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.