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Finding the Fourth Proportional to 85.77, 127.76 and 84.77

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Solution

The fourth proportional to 85.77, 127.76 and 84.77 is: 126.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.77 : 127.76 = 84.77 : x
  2. Step 2: Convert to fraction form
    85.77/127.76 = 84.77/x
  3. Step 3: Cross multiply
    85.77x = 127.76 × 84.77
  4. Step 4: Simplify right side
    85.77x = 10,829.15
  5. Step 5: Solve for x
    x = 10,829.15/85.77
  6. Step 6: Final answer
    x = 126.26

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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.