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Finding the Fourth Proportional to 96.75, 144.30 and 86.51

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Solution

The fourth proportional to 96.75, 144.30 and 86.51 is: 129.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.75 : 144.30 = 86.51 : x
  2. Step 2: Convert to fraction form
    96.75/144.30 = 86.51/x
  3. Step 3: Cross multiply
    96.75x = 144.30 × 86.51
  4. Step 4: Simplify right side
    96.75x = 12,483.75
  5. Step 5: Solve for x
    x = 12,483.75/96.75
  6. Step 6: Final answer
    x = 129.03

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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.