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Finding the Fourth Proportional to 89.31, 133.79 and 58.78

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Solution

The fourth proportional to 89.31, 133.79 and 58.78 is: 88.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.31 : 133.79 = 58.78 : x
  2. Step 2: Convert to fraction form
    89.31/133.79 = 58.78/x
  3. Step 3: Cross multiply
    89.31x = 133.79 × 58.78
  4. Step 4: Simplify right side
    89.31x = 7,864.05
  5. Step 5: Solve for x
    x = 7,864.05/89.31
  6. Step 6: Final answer
    x = 88.06

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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.