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Finding the Fourth Proportional to 663.12, 994.86 and 389.46

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Solution

The fourth proportional to 663.12, 994.86 and 389.46 is: 584.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.12 : 994.86 = 389.46 : x
  2. Step 2: Convert to fraction form
    663.12/994.86 = 389.46/x
  3. Step 3: Cross multiply
    663.12x = 994.86 × 389.46
  4. Step 4: Simplify right side
    663.12x = 387,458.18
  5. Step 5: Solve for x
    x = 387,458.18/663.12
  6. Step 6: Final answer
    x = 584.30

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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.