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Finding the Fourth Proportional to 663.77, 994.89 and 316.61

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Solution

The fourth proportional to 663.77, 994.89 and 316.61 is: 474.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.77 : 994.89 = 316.61 : x
  2. Step 2: Convert to fraction form
    663.77/994.89 = 316.61/x
  3. Step 3: Cross multiply
    663.77x = 994.89 × 316.61
  4. Step 4: Simplify right side
    663.77x = 314,992.12
  5. Step 5: Solve for x
    x = 314,992.12/663.77
  6. Step 6: Final answer
    x = 474.55

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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.