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Finding the Fourth Proportional to 144.92, 215.76 and 144.20

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Solution

The fourth proportional to 144.92, 215.76 and 144.20 is: 214.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.92 : 215.76 = 144.20 : x
  2. Step 2: Convert to fraction form
    144.92/215.76 = 144.20/x
  3. Step 3: Cross multiply
    144.92x = 215.76 × 144.20
  4. Step 4: Simplify right side
    144.92x = 31,112.59
  5. Step 5: Solve for x
    x = 31,112.59/144.92
  6. Step 6: Final answer
    x = 214.69

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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.