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Finding the Fourth Proportional to 319.61, 479.11 and 165.19

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Solution

The fourth proportional to 319.61, 479.11 and 165.19 is: 247.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.61 : 479.11 = 165.19 : x
  2. Step 2: Convert to fraction form
    319.61/479.11 = 165.19/x
  3. Step 3: Cross multiply
    319.61x = 479.11 × 165.19
  4. Step 4: Simplify right side
    319.61x = 79,144.18
  5. Step 5: Solve for x
    x = 79,144.18/319.61
  6. Step 6: Final answer
    x = 247.63

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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.