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Finding the Fourth Proportional to 261.91, 391.79 and 239.10

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Solution

The fourth proportional to 261.91, 391.79 and 239.10 is: 357.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.91 : 391.79 = 239.10 : x
  2. Step 2: Convert to fraction form
    261.91/391.79 = 239.10/x
  3. Step 3: Cross multiply
    261.91x = 391.79 × 239.10
  4. Step 4: Simplify right side
    261.91x = 93,676.99
  5. Step 5: Solve for x
    x = 93,676.99/261.91
  6. Step 6: Final answer
    x = 357.67

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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.