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Finding the Fourth Proportional to 144.74, 215.39 and 139.78

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Solution

The fourth proportional to 144.74, 215.39 and 139.78 is: 208.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.74 : 215.39 = 139.78 : x
  2. Step 2: Convert to fraction form
    144.74/215.39 = 139.78/x
  3. Step 3: Cross multiply
    144.74x = 215.39 × 139.78
  4. Step 4: Simplify right side
    144.74x = 30,107.05
  5. Step 5: Solve for x
    x = 30,107.05/144.74
  6. Step 6: Final answer
    x = 208.00

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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.