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Finding the Fourth Proportional to 90.70, 136.06 and 45.04

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Solution

The fourth proportional to 90.70, 136.06 and 45.04 is: 67.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.70 : 136.06 = 45.04 : x
  2. Step 2: Convert to fraction form
    90.70/136.06 = 45.04/x
  3. Step 3: Cross multiply
    90.70x = 136.06 × 45.04
  4. Step 4: Simplify right side
    90.70x = 6,128.14
  5. Step 5: Solve for x
    x = 6,128.14/90.70
  6. Step 6: Final answer
    x = 67.56

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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.