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Finding the Fourth Proportional to 262.42, 393.68 and 89.11

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Solution

The fourth proportional to 262.42, 393.68 and 89.11 is: 133.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.42 : 393.68 = 89.11 : x
  2. Step 2: Convert to fraction form
    262.42/393.68 = 89.11/x
  3. Step 3: Cross multiply
    262.42x = 393.68 × 89.11
  4. Step 4: Simplify right side
    262.42x = 35,079.93
  5. Step 5: Solve for x
    x = 35,079.93/262.42
  6. Step 6: Final answer
    x = 133.68

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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.