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Finding the Fourth Proportional to 992.91, 1,488.90 and 299.40

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Solution

The fourth proportional to 992.91, 1,488.90 and 299.40 is: 448.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.91 : 1,488.90 = 299.40 : x
  2. Step 2: Convert to fraction form
    992.91/1,488.90 = 299.40/x
  3. Step 3: Cross multiply
    992.91x = 1,488.90 × 299.40
  4. Step 4: Simplify right side
    992.91x = 445,776.66
  5. Step 5: Solve for x
    x = 445,776.66/992.91
  6. Step 6: Final answer
    x = 448.96

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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.