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Finding the Fourth Proportional to 663.30, 994.59 and 316.72

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Solution

The fourth proportional to 663.30, 994.59 and 316.72 is: 474.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.30 : 994.59 = 316.72 : x
  2. Step 2: Convert to fraction form
    663.30/994.59 = 316.72/x
  3. Step 3: Cross multiply
    663.30x = 994.59 × 316.72
  4. Step 4: Simplify right side
    663.30x = 315,004.10
  5. Step 5: Solve for x
    x = 315,004.10/663.30
  6. Step 6: Final answer
    x = 474.91

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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.