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Finding the Fourth Proportional to 144.84, 199.88 and 86.61

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Solution

The fourth proportional to 144.84, 199.88 and 86.61 is: 119.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.84 : 199.88 = 86.61 : x
  2. Step 2: Convert to fraction form
    144.84/199.88 = 86.61/x
  3. Step 3: Cross multiply
    144.84x = 199.88 × 86.61
  4. Step 4: Simplify right side
    144.84x = 17,311.61
  5. Step 5: Solve for x
    x = 17,311.61/144.84
  6. Step 6: Final answer
    x = 119.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.