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Finding the Fourth Proportional to 262.81, 393.94 and 100.45

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Solution

The fourth proportional to 262.81, 393.94 and 100.45 is: 150.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.81 : 393.94 = 100.45 : x
  2. Step 2: Convert to fraction form
    262.81/393.94 = 100.45/x
  3. Step 3: Cross multiply
    262.81x = 393.94 × 100.45
  4. Step 4: Simplify right side
    262.81x = 39,569.05
  5. Step 5: Solve for x
    x = 39,569.05/262.81
  6. Step 6: Final answer
    x = 150.56

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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.