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Finding the Fourth Proportional to 611.32, 843.38 and 378.28

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Solution

The fourth proportional to 611.32, 843.38 and 378.28 is: 521.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.32 : 843.38 = 378.28 : x
  2. Step 2: Convert to fraction form
    611.32/843.38 = 378.28/x
  3. Step 3: Cross multiply
    611.32x = 843.38 × 378.28
  4. Step 4: Simplify right side
    611.32x = 319,033.79
  5. Step 5: Solve for x
    x = 319,033.79/611.32
  6. Step 6: Final answer
    x = 521.88

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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.