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Finding the Fourth Proportional to 84.56, 127.36 and 77.16

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Solution

The fourth proportional to 84.56, 127.36 and 77.16 is: 116.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.56 : 127.36 = 77.16 : x
  2. Step 2: Convert to fraction form
    84.56/127.36 = 77.16/x
  3. Step 3: Cross multiply
    84.56x = 127.36 × 77.16
  4. Step 4: Simplify right side
    84.56x = 9,827.10
  5. Step 5: Solve for x
    x = 9,827.10/84.56
  6. Step 6: Final answer
    x = 116.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.