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Finding the Fourth Proportional to 96.69, 144.65 and 86.45

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Solution

The fourth proportional to 96.69, 144.65 and 86.45 is: 129.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.69 : 144.65 = 86.45 : x
  2. Step 2: Convert to fraction form
    96.69/144.65 = 86.45/x
  3. Step 3: Cross multiply
    96.69x = 144.65 × 86.45
  4. Step 4: Simplify right side
    96.69x = 12,503.84
  5. Step 5: Solve for x
    x = 12,503.84/96.69
  6. Step 6: Final answer
    x = 129.32

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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.