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Finding the Fourth Proportional to 990.99, 1,488.92 and 935.73

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Solution

The fourth proportional to 990.99, 1,488.92 and 935.73 is: 1,405.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.99 : 1,488.92 = 935.73 : x
  2. Step 2: Convert to fraction form
    990.99/1,488.92 = 935.73/x
  3. Step 3: Cross multiply
    990.99x = 1,488.92 × 935.73
  4. Step 4: Simplify right side
    990.99x = 1,393,222.43
  5. Step 5: Solve for x
    x = 1,393,222.43/990.99
  6. Step 6: Final answer
    x = 1,405.89

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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.