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Finding the Fourth Proportional to 96.51, 144.80 and 47.78

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Solution

The fourth proportional to 96.51, 144.80 and 47.78 is: 71.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.51 : 144.80 = 47.78 : x
  2. Step 2: Convert to fraction form
    96.51/144.80 = 47.78/x
  3. Step 3: Cross multiply
    96.51x = 144.80 × 47.78
  4. Step 4: Simplify right side
    96.51x = 6,918.54
  5. Step 5: Solve for x
    x = 6,918.54/96.51
  6. Step 6: Final answer
    x = 71.69

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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.