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Finding the Fourth Proportional to 92.31, 138.41 and 43.57

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Solution

The fourth proportional to 92.31, 138.41 and 43.57 is: 65.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.31 : 138.41 = 43.57 : x
  2. Step 2: Convert to fraction form
    92.31/138.41 = 43.57/x
  3. Step 3: Cross multiply
    92.31x = 138.41 × 43.57
  4. Step 4: Simplify right side
    92.31x = 6,030.87
  5. Step 5: Solve for x
    x = 6,030.87/92.31
  6. Step 6: Final answer
    x = 65.33

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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.