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Finding the Fourth Proportional to 663.69, 994.40 and 355.69

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Solution

The fourth proportional to 663.69, 994.40 and 355.69 is: 532.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.69 : 994.40 = 355.69 : x
  2. Step 2: Convert to fraction form
    663.69/994.40 = 355.69/x
  3. Step 3: Cross multiply
    663.69x = 994.40 × 355.69
  4. Step 4: Simplify right side
    663.69x = 353,693.87
  5. Step 5: Solve for x
    x = 353,693.87/663.69
  6. Step 6: Final answer
    x = 532.92

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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.