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Finding the Fourth Proportional to 144.49, 199.40 and 78.99

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Solution

The fourth proportional to 144.49, 199.40 and 78.99 is: 109.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.49 : 199.40 = 78.99 : x
  2. Step 2: Convert to fraction form
    144.49/199.40 = 78.99/x
  3. Step 3: Cross multiply
    144.49x = 199.40 × 78.99
  4. Step 4: Simplify right side
    144.49x = 15,750.61
  5. Step 5: Solve for x
    x = 15,750.61/144.49
  6. Step 6: Final answer
    x = 109.01

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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.