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Finding the Fourth Proportional to 340.78, 511.56 and 187

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Solution

The fourth proportional to 340.78, 511.56 and 187 is: 280.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.78 : 511.56 = 187 : x
  2. Step 2: Convert to fraction form
    340.78/511.56 = 187/x
  3. Step 3: Cross multiply
    340.78x = 511.56 × 187
  4. Step 4: Simplify right side
    340.78x = 95,661.72
  5. Step 5: Solve for x
    x = 95,661.72/340.78
  6. Step 6: Final answer
    x = 280.71

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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.