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Finding the Fourth Proportional to 144.69, 199.64 and 86.45

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Solution

The fourth proportional to 144.69, 199.64 and 86.45 is: 119.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.69 : 199.64 = 86.45 : x
  2. Step 2: Convert to fraction form
    144.69/199.64 = 86.45/x
  3. Step 3: Cross multiply
    144.69x = 199.64 × 86.45
  4. Step 4: Simplify right side
    144.69x = 17,257.45
  5. Step 5: Solve for x
    x = 17,257.45/144.69
  6. Step 6: Final answer
    x = 119.27

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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.