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Finding the Fourth Proportional to 611.70, 844.14 and 378.78

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Solution

The fourth proportional to 611.70, 844.14 and 378.78 is: 522.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.70 : 844.14 = 378.78 : x
  2. Step 2: Convert to fraction form
    611.70/844.14 = 378.78/x
  3. Step 3: Cross multiply
    611.70x = 844.14 × 378.78
  4. Step 4: Simplify right side
    611.70x = 319,743.35
  5. Step 5: Solve for x
    x = 319,743.35/611.70
  6. Step 6: Final answer
    x = 522.71

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Double scale
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1.5x scale

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.