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Finding the Fourth Proportional to 144.45, 215.39 and 140.00

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Solution

The fourth proportional to 144.45, 215.39 and 140.00 is: 208.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.45 : 215.39 = 140.00 : x
  2. Step 2: Convert to fraction form
    144.45/215.39 = 140.00/x
  3. Step 3: Cross multiply
    144.45x = 215.39 × 140.00
  4. Step 4: Simplify right side
    144.45x = 30,153.87
  5. Step 5: Solve for x
    x = 30,153.87/144.45
  6. Step 6: Final answer
    x = 208.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.