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Finding the Fourth Proportional to 262.20, 393.24 and 99.90

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Solution

The fourth proportional to 262.20, 393.24 and 99.90 is: 149.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.20 : 393.24 = 99.90 : x
  2. Step 2: Convert to fraction form
    262.20/393.24 = 99.90/x
  3. Step 3: Cross multiply
    262.20x = 393.24 × 99.90
  4. Step 4: Simplify right side
    262.20x = 39,284.68
  5. Step 5: Solve for x
    x = 39,284.68/262.20
  6. Step 6: Final answer
    x = 149.83

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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.