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Finding the Fourth Proportional to 612.91, 845.25 and 391.48

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Solution

The fourth proportional to 612.91, 845.25 and 391.48 is: 539.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.91 : 845.25 = 391.48 : x
  2. Step 2: Convert to fraction form
    612.91/845.25 = 391.48/x
  3. Step 3: Cross multiply
    612.91x = 845.25 × 391.48
  4. Step 4: Simplify right side
    612.91x = 330,898.47
  5. Step 5: Solve for x
    x = 330,898.47/612.91
  6. Step 6: Final answer
    x = 539.88

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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.