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Finding the Fourth Proportional to 144.09, 216.03 and 66.95

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Solution

The fourth proportional to 144.09, 216.03 and 66.95 is: 100.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.09 : 216.03 = 66.95 : x
  2. Step 2: Convert to fraction form
    144.09/216.03 = 66.95/x
  3. Step 3: Cross multiply
    144.09x = 216.03 × 66.95
  4. Step 4: Simplify right side
    144.09x = 14,461.79
  5. Step 5: Solve for x
    x = 14,461.79/144.09
  6. Step 6: Final answer
    x = 100.37

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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.