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Finding the Fourth Proportional to 612.42, 845.24 and 391.48

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Solution

The fourth proportional to 612.42, 845.24 and 391.48 is: 540.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.42 : 845.24 = 391.48 : x
  2. Step 2: Convert to fraction form
    612.42/845.24 = 391.48/x
  3. Step 3: Cross multiply
    612.42x = 845.24 × 391.48
  4. Step 4: Simplify right side
    612.42x = 330,894.56
  5. Step 5: Solve for x
    x = 330,894.56/612.42
  6. Step 6: Final answer
    x = 540.31

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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.