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Finding the Fourth Proportional to 262.53, 393.78 and 89.19

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Solution

The fourth proportional to 262.53, 393.78 and 89.19 is: 133.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.53 : 393.78 = 89.19 : x
  2. Step 2: Convert to fraction form
    262.53/393.78 = 89.19/x
  3. Step 3: Cross multiply
    262.53x = 393.78 × 89.19
  4. Step 4: Simplify right side
    262.53x = 35,121.24
  5. Step 5: Solve for x
    x = 35,121.24/262.53
  6. Step 6: Final answer
    x = 133.78

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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.