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Finding the Fourth Proportional to 144.36, 216.60 and 72.18

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Solution

The fourth proportional to 144.36, 216.60 and 72.18 is: 108.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.36 : 216.60 = 72.18 : x
  2. Step 2: Convert to fraction form
    144.36/216.60 = 72.18/x
  3. Step 3: Cross multiply
    144.36x = 216.60 × 72.18
  4. Step 4: Simplify right side
    144.36x = 15,634.19
  5. Step 5: Solve for x
    x = 15,634.19/144.36
  6. Step 6: Final answer
    x = 108.30

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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.