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Finding the Fourth Proportional to 939.93, 1,406.25 and 662.91

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Solution

The fourth proportional to 939.93, 1,406.25 and 662.91 is: 991.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.93 : 1,406.25 = 662.91 : x
  2. Step 2: Convert to fraction form
    939.93/1,406.25 = 662.91/x
  3. Step 3: Cross multiply
    939.93x = 1,406.25 × 662.91
  4. Step 4: Simplify right side
    939.93x = 932,217.19
  5. Step 5: Solve for x
    x = 932,217.19/939.93
  6. Step 6: Final answer
    x = 991.79

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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.