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Finding the Fourth Proportional to 612.07, 844.78 and 390.97

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Solution

The fourth proportional to 612.07, 844.78 and 390.97 is: 539.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.07 : 844.78 = 390.97 : x
  2. Step 2: Convert to fraction form
    612.07/844.78 = 390.97/x
  3. Step 3: Cross multiply
    612.07x = 844.78 × 390.97
  4. Step 4: Simplify right side
    612.07x = 330,283.64
  5. Step 5: Solve for x
    x = 330,283.64/612.07
  6. Step 6: Final answer
    x = 539.62

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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.