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Finding the Fourth Proportional to 90.79, 135.97 and 75.46

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Solution

The fourth proportional to 90.79, 135.97 and 75.46 is: 113.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.79 : 135.97 = 75.46 : x
  2. Step 2: Convert to fraction form
    90.79/135.97 = 75.46/x
  3. Step 3: Cross multiply
    90.79x = 135.97 × 75.46
  4. Step 4: Simplify right side
    90.79x = 10,260.30
  5. Step 5: Solve for x
    x = 10,260.30/90.79
  6. Step 6: Final answer
    x = 113.01

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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.