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Finding the Fourth Proportional to 612.97, 920.06 and 381.92

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Solution

The fourth proportional to 612.97, 920.06 and 381.92 is: 573.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.97 : 920.06 = 381.92 : x
  2. Step 2: Convert to fraction form
    612.97/920.06 = 381.92/x
  3. Step 3: Cross multiply
    612.97x = 920.06 × 381.92
  4. Step 4: Simplify right side
    612.97x = 351,384.24
  5. Step 5: Solve for x
    x = 351,384.24/612.97
  6. Step 6: Final answer
    x = 573.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.