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Finding the Fourth Proportional to 612.05, 844.34 and 390.92

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Solution

The fourth proportional to 612.05, 844.34 and 390.92 is: 539.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.05 : 844.34 = 390.92 : x
  2. Step 2: Convert to fraction form
    612.05/844.34 = 390.92/x
  3. Step 3: Cross multiply
    612.05x = 844.34 × 390.92
  4. Step 4: Simplify right side
    612.05x = 330,063.22
  5. Step 5: Solve for x
    x = 330,063.22/612.05
  6. Step 6: Final answer
    x = 539.28

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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.