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Finding the Fourth Proportional to 89.33, 134.80 and 86.31

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Solution

The fourth proportional to 89.33, 134.80 and 86.31 is: 130.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.33 : 134.80 = 86.31 : x
  2. Step 2: Convert to fraction form
    89.33/134.80 = 86.31/x
  3. Step 3: Cross multiply
    89.33x = 134.80 × 86.31
  4. Step 4: Simplify right side
    89.33x = 11,634.37
  5. Step 5: Solve for x
    x = 11,634.37/89.33
  6. Step 6: Final answer
    x = 130.25

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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.