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Finding the Fourth Proportional to 90.03, 134.85 and 79.78

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Solution

The fourth proportional to 90.03, 134.85 and 79.78 is: 119.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.03 : 134.85 = 79.78 : x
  2. Step 2: Convert to fraction form
    90.03/134.85 = 79.78/x
  3. Step 3: Cross multiply
    90.03x = 134.85 × 79.78
  4. Step 4: Simplify right side
    90.03x = 10,758.80
  5. Step 5: Solve for x
    x = 10,758.80/90.03
  6. Step 6: Final answer
    x = 119.50

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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.