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Finding the Fourth Proportional to 86.26, 118.60 and 77.46

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Solution

The fourth proportional to 86.26, 118.60 and 77.46 is: 106.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.26 : 118.60 = 77.46 : x
  2. Step 2: Convert to fraction form
    86.26/118.60 = 77.46/x
  3. Step 3: Cross multiply
    86.26x = 118.60 × 77.46
  4. Step 4: Simplify right side
    86.26x = 9,186.76
  5. Step 5: Solve for x
    x = 9,186.76/86.26
  6. Step 6: Final answer
    x = 106.50

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.