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Finding the Fourth Proportional to 144.24, 214.52 and 142.80

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Solution

The fourth proportional to 144.24, 214.52 and 142.80 is: 212.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.24 : 214.52 = 142.80 : x
  2. Step 2: Convert to fraction form
    144.24/214.52 = 142.80/x
  3. Step 3: Cross multiply
    144.24x = 214.52 × 142.80
  4. Step 4: Simplify right side
    144.24x = 30,633.46
  5. Step 5: Solve for x
    x = 30,633.46/144.24
  6. Step 6: Final answer
    x = 212.38

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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.