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Finding the Fourth Proportional to 144.59, 199.62 and 105.21

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Solution

The fourth proportional to 144.59, 199.62 and 105.21 is: 145.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.59 : 199.62 = 105.21 : x
  2. Step 2: Convert to fraction form
    144.59/199.62 = 105.21/x
  3. Step 3: Cross multiply
    144.59x = 199.62 × 105.21
  4. Step 4: Simplify right side
    144.59x = 21,002.02
  5. Step 5: Solve for x
    x = 21,002.02/144.59
  6. Step 6: Final answer
    x = 145.25

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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.