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Finding the Fourth Proportional to 678.38, 934.88 and 611.28

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Solution

The fourth proportional to 678.38, 934.88 and 611.28 is: 842.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.38 : 934.88 = 611.28 : x
  2. Step 2: Convert to fraction form
    678.38/934.88 = 611.28/x
  3. Step 3: Cross multiply
    678.38x = 934.88 × 611.28
  4. Step 4: Simplify right side
    678.38x = 571,470.39
  5. Step 5: Solve for x
    x = 571,470.39/678.38
  6. Step 6: Final answer
    x = 842.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.