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Finding the Fourth Proportional to 261.57, 391.90 and 233.33

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Solution

The fourth proportional to 261.57, 391.90 and 233.33 is: 349.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.57 : 391.90 = 233.33 : x
  2. Step 2: Convert to fraction form
    261.57/391.90 = 233.33/x
  3. Step 3: Cross multiply
    261.57x = 391.90 × 233.33
  4. Step 4: Simplify right side
    261.57x = 91,440.07
  5. Step 5: Solve for x
    x = 91,440.07/261.57
  6. Step 6: Final answer
    x = 349.58

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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.