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Finding the Fourth Proportional to 992.41, 1,490.43 and 668.01

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Solution

The fourth proportional to 992.41, 1,490.43 and 668.01 is: 1,003.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.41 : 1,490.43 = 668.01 : x
  2. Step 2: Convert to fraction form
    992.41/1,490.43 = 668.01/x
  3. Step 3: Cross multiply
    992.41x = 1,490.43 × 668.01
  4. Step 4: Simplify right side
    992.41x = 995,622.14
  5. Step 5: Solve for x
    x = 995,622.14/992.41
  6. Step 6: Final answer
    x = 1,003.24

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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.