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Finding the Fourth Proportional to 261.58, 391.12 and 238.63

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Solution

The fourth proportional to 261.58, 391.12 and 238.63 is: 356.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.58 : 391.12 = 238.63 : x
  2. Step 2: Convert to fraction form
    261.58/391.12 = 238.63/x
  3. Step 3: Cross multiply
    261.58x = 391.12 × 238.63
  4. Step 4: Simplify right side
    261.58x = 93,331.39
  5. Step 5: Solve for x
    x = 93,331.39/261.58
  6. Step 6: Final answer
    x = 356.80

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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.