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Finding the Fourth Proportional to 90.94, 136.68 and 89.06

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Solution

The fourth proportional to 90.94, 136.68 and 89.06 is: 133.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.94 : 136.68 = 89.06 : x
  2. Step 2: Convert to fraction form
    90.94/136.68 = 89.06/x
  3. Step 3: Cross multiply
    90.94x = 136.68 × 89.06
  4. Step 4: Simplify right side
    90.94x = 12,172.72
  5. Step 5: Solve for x
    x = 12,172.72/90.94
  6. Step 6: Final answer
    x = 133.85

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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.