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Finding the Fourth Proportional to 992.87, 1,489.31 and 299.55

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Solution

The fourth proportional to 992.87, 1,489.31 and 299.55 is: 449.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.87 : 1,489.31 = 299.55 : x
  2. Step 2: Convert to fraction form
    992.87/1,489.31 = 299.55/x
  3. Step 3: Cross multiply
    992.87x = 1,489.31 × 299.55
  4. Step 4: Simplify right side
    992.87x = 446,116.11
  5. Step 5: Solve for x
    x = 446,116.11/992.87
  6. Step 6: Final answer
    x = 449.32

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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.