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Finding the Fourth Proportional to 92.20, 127.22 and 56.76

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Solution

The fourth proportional to 92.20, 127.22 and 56.76 is: 78.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.20 : 127.22 = 56.76 : x
  2. Step 2: Convert to fraction form
    92.20/127.22 = 56.76/x
  3. Step 3: Cross multiply
    92.20x = 127.22 × 56.76
  4. Step 4: Simplify right side
    92.20x = 7,221.20
  5. Step 5: Solve for x
    x = 7,221.20/92.20
  6. Step 6: Final answer
    x = 78.32

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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.