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Finding the Fourth Proportional to 86.56, 129.60 and 74.56

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Solution

The fourth proportional to 86.56, 129.60 and 74.56 is: 111.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.56 : 129.60 = 74.56 : x
  2. Step 2: Convert to fraction form
    86.56/129.60 = 74.56/x
  3. Step 3: Cross multiply
    86.56x = 129.60 × 74.56
  4. Step 4: Simplify right side
    86.56x = 9,662.98
  5. Step 5: Solve for x
    x = 9,662.98/86.56
  6. Step 6: Final answer
    x = 111.63

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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.