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Finding the Fourth Proportional to 90.05, 134.96 and 51.47

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Solution

The fourth proportional to 90.05, 134.96 and 51.47 is: 77.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.05 : 134.96 = 51.47 : x
  2. Step 2: Convert to fraction form
    90.05/134.96 = 51.47/x
  3. Step 3: Cross multiply
    90.05x = 134.96 × 51.47
  4. Step 4: Simplify right side
    90.05x = 6,945.97
  5. Step 5: Solve for x
    x = 6,945.97/90.05
  6. Step 6: Final answer
    x = 77.14

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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.