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Finding the Fourth Proportional to 992.92, 1,489.56 and 445.09

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Solution

The fourth proportional to 992.92, 1,489.56 and 445.09 is: 667.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.92 : 1,489.56 = 445.09 : x
  2. Step 2: Convert to fraction form
    992.92/1,489.56 = 445.09/x
  3. Step 3: Cross multiply
    992.92x = 1,489.56 × 445.09
  4. Step 4: Simplify right side
    992.92x = 662,988.26
  5. Step 5: Solve for x
    x = 662,988.26/992.92
  6. Step 6: Final answer
    x = 667.72

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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.