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Finding the Fourth Proportional to 319.61, 479.42 and 127.24

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Solution

The fourth proportional to 319.61, 479.42 and 127.24 is: 190.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.61 : 479.42 = 127.24 : x
  2. Step 2: Convert to fraction form
    319.61/479.42 = 127.24/x
  3. Step 3: Cross multiply
    319.61x = 479.42 × 127.24
  4. Step 4: Simplify right side
    319.61x = 60,999.00
  5. Step 5: Solve for x
    x = 60,999.00/319.61
  6. Step 6: Final answer
    x = 190.85

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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.