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Finding the Fourth Proportional to 319.61, 479.84 and 165.64

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Solution

The fourth proportional to 319.61, 479.84 and 165.64 is: 248.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.61 : 479.84 = 165.64 : x
  2. Step 2: Convert to fraction form
    319.61/479.84 = 165.64/x
  3. Step 3: Cross multiply
    319.61x = 479.84 × 165.64
  4. Step 4: Simplify right side
    319.61x = 79,479.91
  5. Step 5: Solve for x
    x = 79,479.91/319.61
  6. Step 6: Final answer
    x = 248.68

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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.