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Finding the Fourth Proportional to 92, 138 and 90.80

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Solution

The fourth proportional to 92, 138 and 90.80 is: 136.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    92 : 138 = 90.80 : x
  2. Step 2: Convert to fraction form
    92/138 = 90.80/x
  3. Step 3: Cross multiply
    92x = 138 × 90.80
  4. Step 4: Simplify right side
    92x = 12,530.40
  5. Step 5: Solve for x
    x = 12,530.40/92
  6. Step 6: Final answer
    x = 136.20

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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.