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Finding the Fourth Proportional to 663.27, 993.99 and 388.98

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Solution

The fourth proportional to 663.27, 993.99 and 388.98 is: 582.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.27 : 993.99 = 388.98 : x
  2. Step 2: Convert to fraction form
    663.27/993.99 = 388.98/x
  3. Step 3: Cross multiply
    663.27x = 993.99 × 388.98
  4. Step 4: Simplify right side
    663.27x = 386,642.23
  5. Step 5: Solve for x
    x = 386,642.23/663.27
  6. Step 6: Final answer
    x = 582.93

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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.