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Finding the Fourth Proportional to 262.84, 393.72 and 211.20

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Solution

The fourth proportional to 262.84, 393.72 and 211.20 is: 316.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.84 : 393.72 = 211.20 : x
  2. Step 2: Convert to fraction form
    262.84/393.72 = 211.20/x
  3. Step 3: Cross multiply
    262.84x = 393.72 × 211.20
  4. Step 4: Simplify right side
    262.84x = 83,153.66
  5. Step 5: Solve for x
    x = 83,153.66/262.84
  6. Step 6: Final answer
    x = 316.37

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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.