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Finding the Fourth Proportional to 611.90, 844.65 and 391.04

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Solution

The fourth proportional to 611.90, 844.65 and 391.04 is: 539.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.90 : 844.65 = 391.04 : x
  2. Step 2: Convert to fraction form
    611.90/844.65 = 391.04/x
  3. Step 3: Cross multiply
    611.90x = 844.65 × 391.04
  4. Step 4: Simplify right side
    611.90x = 330,287.71
  5. Step 5: Solve for x
    x = 330,287.71/611.90
  6. Step 6: Final answer
    x = 539.78

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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.