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Finding the Fourth Proportional to 144.05, 216.20 and 83.30

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Solution

The fourth proportional to 144.05, 216.20 and 83.30 is: 125.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.05 : 216.20 = 83.30 : x
  2. Step 2: Convert to fraction form
    144.05/216.20 = 83.30/x
  3. Step 3: Cross multiply
    144.05x = 216.20 × 83.30
  4. Step 4: Simplify right side
    144.05x = 18,008.59
  5. Step 5: Solve for x
    x = 18,008.59/144.05
  6. Step 6: Final answer
    x = 125.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.