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Finding the Fourth Proportional to 261.97, 393.56 and 153.83

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Solution

The fourth proportional to 261.97, 393.56 and 153.83 is: 231.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.97 : 393.56 = 153.83 : x
  2. Step 2: Convert to fraction form
    261.97/393.56 = 153.83/x
  3. Step 3: Cross multiply
    261.97x = 393.56 × 153.83
  4. Step 4: Simplify right side
    261.97x = 60,542.13
  5. Step 5: Solve for x
    x = 60,542.13/261.97
  6. Step 6: Final answer
    x = 231.11

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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.