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Finding the Fourth Proportional to 225.47, 311.12 and 127.21

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Solution

The fourth proportional to 225.47, 311.12 and 127.21 is: 175.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.47 : 311.12 = 127.21 : x
  2. Step 2: Convert to fraction form
    225.47/311.12 = 127.21/x
  3. Step 3: Cross multiply
    225.47x = 311.12 × 127.21
  4. Step 4: Simplify right side
    225.47x = 39,577.12
  5. Step 5: Solve for x
    x = 39,577.12/225.47
  6. Step 6: Final answer
    x = 175.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.