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Finding the Fourth Proportional to 612.54, 845.41 and 391.48

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Solution

The fourth proportional to 612.54, 845.41 and 391.48 is: 540.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.54 : 845.41 = 391.48 : x
  2. Step 2: Convert to fraction form
    612.54/845.41 = 391.48/x
  3. Step 3: Cross multiply
    612.54x = 845.41 × 391.48
  4. Step 4: Simplify right side
    612.54x = 330,964.61
  5. Step 5: Solve for x
    x = 330,964.61/612.54
  6. Step 6: Final answer
    x = 540.32

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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.