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Finding the Fourth Proportional to 90.74, 136.18 and 70.49

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Solution

The fourth proportional to 90.74, 136.18 and 70.49 is: 105.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.74 : 136.18 = 70.49 : x
  2. Step 2: Convert to fraction form
    90.74/136.18 = 70.49/x
  3. Step 3: Cross multiply
    90.74x = 136.18 × 70.49
  4. Step 4: Simplify right side
    90.74x = 9,599.49
  5. Step 5: Solve for x
    x = 9,599.49/90.74
  6. Step 6: Final answer
    x = 105.79

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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.