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Finding the Fourth Proportional to 89.78, 134.46 and 59.40

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Solution

The fourth proportional to 89.78, 134.46 and 59.40 is: 88.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.78 : 134.46 = 59.40 : x
  2. Step 2: Convert to fraction form
    89.78/134.46 = 59.40/x
  3. Step 3: Cross multiply
    89.78x = 134.46 × 59.40
  4. Step 4: Simplify right side
    89.78x = 7,986.92
  5. Step 5: Solve for x
    x = 7,986.92/89.78
  6. Step 6: Final answer
    x = 88.97

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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.