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Finding the Fourth Proportional to 85.13, 127.71 and 76.64

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Solution

The fourth proportional to 85.13, 127.71 and 76.64 is: 114.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.13 : 127.71 = 76.64 : x
  2. Step 2: Convert to fraction form
    85.13/127.71 = 76.64/x
  3. Step 3: Cross multiply
    85.13x = 127.71 × 76.64
  4. Step 4: Simplify right side
    85.13x = 9,787.69
  5. Step 5: Solve for x
    x = 9,787.69/85.13
  6. Step 6: Final answer
    x = 114.97

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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.