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Finding the Fourth Proportional to 612.18, 844.99 and 487.80

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Solution

The fourth proportional to 612.18, 844.99 and 487.80 is: 673.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.18 : 844.99 = 487.80 : x
  2. Step 2: Convert to fraction form
    612.18/844.99 = 487.80/x
  3. Step 3: Cross multiply
    612.18x = 844.99 × 487.80
  4. Step 4: Simplify right side
    612.18x = 412,185.96
  5. Step 5: Solve for x
    x = 412,185.96/612.18
  6. Step 6: Final answer
    x = 673.31

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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.