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Finding the Fourth Proportional to 319.59, 479.17 and 143.83

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Solution

The fourth proportional to 319.59, 479.17 and 143.83 is: 215.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.59 : 479.17 = 143.83 : x
  2. Step 2: Convert to fraction form
    319.59/479.17 = 143.83/x
  3. Step 3: Cross multiply
    319.59x = 479.17 × 143.83
  4. Step 4: Simplify right side
    319.59x = 68,919.02
  5. Step 5: Solve for x
    x = 68,919.02/319.59
  6. Step 6: Final answer
    x = 215.65

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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.