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Finding the Fourth Proportional to 990.88, 1,486.80 and 443.44

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Solution

The fourth proportional to 990.88, 1,486.80 and 443.44 is: 665.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.88 : 1,486.80 = 443.44 : x
  2. Step 2: Convert to fraction form
    990.88/1,486.80 = 443.44/x
  3. Step 3: Cross multiply
    990.88x = 1,486.80 × 443.44
  4. Step 4: Simplify right side
    990.88x = 659,306.59
  5. Step 5: Solve for x
    x = 659,306.59/990.88
  6. Step 6: Final answer
    x = 665.37

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1.5x scale

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.