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Finding the Fourth Proportional to 92.42, 138.00 and 83.90

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Solution

The fourth proportional to 92.42, 138.00 and 83.90 is: 125.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.42 : 138.00 = 83.90 : x
  2. Step 2: Convert to fraction form
    92.42/138.00 = 83.90/x
  3. Step 3: Cross multiply
    92.42x = 138.00 × 83.90
  4. Step 4: Simplify right side
    92.42x = 11,578.41
  5. Step 5: Solve for x
    x = 11,578.41/92.42
  6. Step 6: Final answer
    x = 125.28

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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.