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Finding the Fourth Proportional to 319.92, 479.78 and 165.80

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Solution

The fourth proportional to 319.92, 479.78 and 165.80 is: 248.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.92 : 479.78 = 165.80 : x
  2. Step 2: Convert to fraction form
    319.92/479.78 = 165.80/x
  3. Step 3: Cross multiply
    319.92x = 479.78 × 165.80
  4. Step 4: Simplify right side
    319.92x = 79,547.52
  5. Step 5: Solve for x
    x = 79,547.52/319.92
  6. Step 6: Final answer
    x = 248.65

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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.