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Finding the Fourth Proportional to 261.16, 391.38 and 188.68

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Solution

The fourth proportional to 261.16, 391.38 and 188.68 is: 282.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.16 : 391.38 = 188.68 : x
  2. Step 2: Convert to fraction form
    261.16/391.38 = 188.68/x
  3. Step 3: Cross multiply
    261.16x = 391.38 × 188.68
  4. Step 4: Simplify right side
    261.16x = 73,845.58
  5. Step 5: Solve for x
    x = 73,845.58/261.16
  6. Step 6: Final answer
    x = 282.76

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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.