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Finding the Fourth Proportional to 90.46, 135.55 and 69.99

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Solution

The fourth proportional to 90.46, 135.55 and 69.99 is: 104.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.46 : 135.55 = 69.99 : x
  2. Step 2: Convert to fraction form
    90.46/135.55 = 69.99/x
  3. Step 3: Cross multiply
    90.46x = 135.55 × 69.99
  4. Step 4: Simplify right side
    90.46x = 9,487.14
  5. Step 5: Solve for x
    x = 9,487.14/90.46
  6. Step 6: Final answer
    x = 104.88

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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.