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Finding the Fourth Proportional to 612.16, 844.87 and 391.18

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Solution

The fourth proportional to 612.16, 844.87 and 391.18 is: 539.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.16 : 844.87 = 391.18 : x
  2. Step 2: Convert to fraction form
    612.16/844.87 = 391.18/x
  3. Step 3: Cross multiply
    612.16x = 844.87 × 391.18
  4. Step 4: Simplify right side
    612.16x = 330,496.25
  5. Step 5: Solve for x
    x = 330,496.25/612.16
  6. Step 6: Final answer
    x = 539.89

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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.