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Finding the Fourth Proportional to 992.91, 1,489.62 and 445.48

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Solution

The fourth proportional to 992.91, 1,489.62 and 445.48 is: 668.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.91 : 1,489.62 = 445.48 : x
  2. Step 2: Convert to fraction form
    992.91/1,489.62 = 445.48/x
  3. Step 3: Cross multiply
    992.91x = 1,489.62 × 445.48
  4. Step 4: Simplify right side
    992.91x = 663,602.24
  5. Step 5: Solve for x
    x = 663,602.24/992.91
  6. Step 6: Final answer
    x = 668.34

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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.