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Finding the Fourth Proportional to 612.23, 844.99 and 391.43

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Solution

The fourth proportional to 612.23, 844.99 and 391.43 is: 540.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.23 : 844.99 = 391.43 : x
  2. Step 2: Convert to fraction form
    612.23/844.99 = 391.43/x
  3. Step 3: Cross multiply
    612.23x = 844.99 × 391.43
  4. Step 4: Simplify right side
    612.23x = 330,754.44
  5. Step 5: Solve for x
    x = 330,754.44/612.23
  6. Step 6: Final answer
    x = 540.25

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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.