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Finding the Fourth Proportional to 96.78, 145.05 and 51.12

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Solution

The fourth proportional to 96.78, 145.05 and 51.12 is: 76.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.78 : 145.05 = 51.12 : x
  2. Step 2: Convert to fraction form
    96.78/145.05 = 51.12/x
  3. Step 3: Cross multiply
    96.78x = 145.05 × 51.12
  4. Step 4: Simplify right side
    96.78x = 7,414.96
  5. Step 5: Solve for x
    x = 7,414.96/96.78
  6. Step 6: Final answer
    x = 76.62

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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.