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Finding the Fourth Proportional to 611.26, 843.55 and 478.65

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Solution

The fourth proportional to 611.26, 843.55 and 478.65 is: 660.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.26 : 843.55 = 478.65 : x
  2. Step 2: Convert to fraction form
    611.26/843.55 = 478.65/x
  3. Step 3: Cross multiply
    611.26x = 843.55 × 478.65
  4. Step 4: Simplify right side
    611.26x = 403,767.17
  5. Step 5: Solve for x
    x = 403,767.17/611.26
  6. Step 6: Final answer
    x = 660.55

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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.