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Finding the Fourth Proportional to 90.65, 136.02 and 70.54

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Solution

The fourth proportional to 90.65, 136.02 and 70.54 is: 105.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.65 : 136.02 = 70.54 : x
  2. Step 2: Convert to fraction form
    90.65/136.02 = 70.54/x
  3. Step 3: Cross multiply
    90.65x = 136.02 × 70.54
  4. Step 4: Simplify right side
    90.65x = 9,594.85
  5. Step 5: Solve for x
    x = 9,594.85/90.65
  6. Step 6: Final answer
    x = 105.85

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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.