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Finding the Fourth Proportional to 92.85, 138.38 and 89.91

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Solution

The fourth proportional to 92.85, 138.38 and 89.91 is: 133.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.85 : 138.38 = 89.91 : x
  2. Step 2: Convert to fraction form
    92.85/138.38 = 89.91/x
  3. Step 3: Cross multiply
    92.85x = 138.38 × 89.91
  4. Step 4: Simplify right side
    92.85x = 12,441.30
  5. Step 5: Solve for x
    x = 12,441.30/92.85
  6. Step 6: Final answer
    x = 133.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.