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Finding the Fourth Proportional to 319.54, 479.32 and 143.86

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Solution

The fourth proportional to 319.54, 479.32 and 143.86 is: 215.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.54 : 479.32 = 143.86 : x
  2. Step 2: Convert to fraction form
    319.54/479.32 = 143.86/x
  3. Step 3: Cross multiply
    319.54x = 479.32 × 143.86
  4. Step 4: Simplify right side
    319.54x = 68,954.98
  5. Step 5: Solve for x
    x = 68,954.98/319.54
  6. Step 6: Final answer
    x = 215.79

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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.