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Finding the Fourth Proportional to 262.36, 393.64 and 140.72

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Solution

The fourth proportional to 262.36, 393.64 and 140.72 is: 211.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.36 : 393.64 = 140.72 : x
  2. Step 2: Convert to fraction form
    262.36/393.64 = 140.72/x
  3. Step 3: Cross multiply
    262.36x = 393.64 × 140.72
  4. Step 4: Simplify right side
    262.36x = 55,393.02
  5. Step 5: Solve for x
    x = 55,393.02/262.36
  6. Step 6: Final answer
    x = 211.13

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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.