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Finding the Fourth Proportional to 262.51, 393.78 and 140.86

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Solution

The fourth proportional to 262.51, 393.78 and 140.86 is: 211.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.51 : 393.78 = 140.86 : x
  2. Step 2: Convert to fraction form
    262.51/393.78 = 140.86/x
  3. Step 3: Cross multiply
    262.51x = 393.78 × 140.86
  4. Step 4: Simplify right side
    262.51x = 55,467.85
  5. Step 5: Solve for x
    x = 55,467.85/262.51
  6. Step 6: Final answer
    x = 211.30

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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.