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Finding the Fourth Proportional to 144.20, 216.24 and 90.10

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Solution

The fourth proportional to 144.20, 216.24 and 90.10 is: 135.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.20 : 216.24 = 90.10 : x
  2. Step 2: Convert to fraction form
    144.20/216.24 = 90.10/x
  3. Step 3: Cross multiply
    144.20x = 216.24 × 90.10
  4. Step 4: Simplify right side
    144.20x = 19,483.22
  5. Step 5: Solve for x
    x = 19,483.22/144.20
  6. Step 6: Final answer
    x = 135.11

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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.