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Finding the Fourth Proportional to 144.21, 216.36 and 91.47

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Solution

The fourth proportional to 144.21, 216.36 and 91.47 is: 137.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.21 : 216.36 = 91.47 : x
  2. Step 2: Convert to fraction form
    144.21/216.36 = 91.47/x
  3. Step 3: Cross multiply
    144.21x = 216.36 × 91.47
  4. Step 4: Simplify right side
    144.21x = 19,790.45
  5. Step 5: Solve for x
    x = 19,790.45/144.21
  6. Step 6: Final answer
    x = 137.23

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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.