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Finding the Fourth Proportional to 401.75, 602.65 and 127.85

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Solution

The fourth proportional to 401.75, 602.65 and 127.85 is: 191.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.75 : 602.65 = 127.85 : x
  2. Step 2: Convert to fraction form
    401.75/602.65 = 127.85/x
  3. Step 3: Cross multiply
    401.75x = 602.65 × 127.85
  4. Step 4: Simplify right side
    401.75x = 77,048.80
  5. Step 5: Solve for x
    x = 77,048.80/401.75
  6. Step 6: Final answer
    x = 191.78

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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.