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Finding the Fourth Proportional to 990.06, 1,474.82 and 935.34

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Solution

The fourth proportional to 990.06, 1,474.82 and 935.34 is: 1,393.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.06 : 1,474.82 = 935.34 : x
  2. Step 2: Convert to fraction form
    990.06/1,474.82 = 935.34/x
  3. Step 3: Cross multiply
    990.06x = 1,474.82 × 935.34
  4. Step 4: Simplify right side
    990.06x = 1,379,453.46
  5. Step 5: Solve for x
    x = 1,379,453.46/990.06
  6. Step 6: Final answer
    x = 1,393.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.