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Finding the Fourth Proportional to 340.76, 511.50 and 212.78

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Solution

The fourth proportional to 340.76, 511.50 and 212.78 is: 319.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.76 : 511.50 = 212.78 : x
  2. Step 2: Convert to fraction form
    340.76/511.50 = 212.78/x
  3. Step 3: Cross multiply
    340.76x = 511.50 × 212.78
  4. Step 4: Simplify right side
    340.76x = 108,836.97
  5. Step 5: Solve for x
    x = 108,836.97/340.76
  6. Step 6: Final answer
    x = 319.39

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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.