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Finding the Fourth Proportional to 990.57, 1,486.89 and 443.13

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Solution

The fourth proportional to 990.57, 1,486.89 and 443.13 is: 665.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.57 : 1,486.89 = 443.13 : x
  2. Step 2: Convert to fraction form
    990.57/1,486.89 = 443.13/x
  3. Step 3: Cross multiply
    990.57x = 1,486.89 × 443.13
  4. Step 4: Simplify right side
    990.57x = 658,885.57
  5. Step 5: Solve for x
    x = 658,885.57/990.57
  6. Step 6: Final answer
    x = 665.16

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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.