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Finding the Fourth Proportional to 144.21, 216.53 and 83.46

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Solution

The fourth proportional to 144.21, 216.53 and 83.46 is: 125.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.21 : 216.53 = 83.46 : x
  2. Step 2: Convert to fraction form
    144.21/216.53 = 83.46/x
  3. Step 3: Cross multiply
    144.21x = 216.53 × 83.46
  4. Step 4: Simplify right side
    144.21x = 18,071.18
  5. Step 5: Solve for x
    x = 18,071.18/144.21
  6. Step 6: Final answer
    x = 125.31

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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.