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Finding the Fourth Proportional to 86.95, 129.93 and 76.55

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Solution

The fourth proportional to 86.95, 129.93 and 76.55 is: 114.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.95 : 129.93 = 76.55 : x
  2. Step 2: Convert to fraction form
    86.95/129.93 = 76.55/x
  3. Step 3: Cross multiply
    86.95x = 129.93 × 76.55
  4. Step 4: Simplify right side
    86.95x = 9,945.42
  5. Step 5: Solve for x
    x = 9,945.42/86.95
  6. Step 6: Final answer
    x = 114.38

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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.