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Finding the Fourth Proportional to 92.31, 138.58 and 51.76

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Solution

The fourth proportional to 92.31, 138.58 and 51.76 is: 77.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.31 : 138.58 = 51.76 : x
  2. Step 2: Convert to fraction form
    92.31/138.58 = 51.76/x
  3. Step 3: Cross multiply
    92.31x = 138.58 × 51.76
  4. Step 4: Simplify right side
    92.31x = 7,172.64
  5. Step 5: Solve for x
    x = 7,172.64/92.31
  6. Step 6: Final answer
    x = 77.70

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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.