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Finding the Fourth Proportional to 319.37, 479.05 and 258.55

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Solution

The fourth proportional to 319.37, 479.05 and 258.55 is: 387.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.37 : 479.05 = 258.55 : x
  2. Step 2: Convert to fraction form
    319.37/479.05 = 258.55/x
  3. Step 3: Cross multiply
    319.37x = 479.05 × 258.55
  4. Step 4: Simplify right side
    319.37x = 123,856.53
  5. Step 5: Solve for x
    x = 123,856.53/319.37
  6. Step 6: Final answer
    x = 387.82

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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.