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Finding the Fourth Proportional to 96.90, 144.71 and 77.26

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Solution

The fourth proportional to 96.90, 144.71 and 77.26 is: 115.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.90 : 144.71 = 77.26 : x
  2. Step 2: Convert to fraction form
    96.90/144.71 = 77.26/x
  3. Step 3: Cross multiply
    96.90x = 144.71 × 77.26
  4. Step 4: Simplify right side
    96.90x = 11,180.29
  5. Step 5: Solve for x
    x = 11,180.29/96.90
  6. Step 6: Final answer
    x = 115.38

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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.