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Finding the Fourth Proportional to 85.67, 127.90 and 79.34

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Solution

The fourth proportional to 85.67, 127.90 and 79.34 is: 118.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.67 : 127.90 = 79.34 : x
  2. Step 2: Convert to fraction form
    85.67/127.90 = 79.34/x
  3. Step 3: Cross multiply
    85.67x = 127.90 × 79.34
  4. Step 4: Simplify right side
    85.67x = 10,146.96
  5. Step 5: Solve for x
    x = 10,146.96/85.67
  6. Step 6: Final answer
    x = 118.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.