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Finding the Fourth Proportional to 939.26, 1,407.68 and 445.66

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Solution

The fourth proportional to 939.26, 1,407.68 and 445.66 is: 667.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.26 : 1,407.68 = 445.66 : x
  2. Step 2: Convert to fraction form
    939.26/1,407.68 = 445.66/x
  3. Step 3: Cross multiply
    939.26x = 1,407.68 × 445.66
  4. Step 4: Simplify right side
    939.26x = 627,346.67
  5. Step 5: Solve for x
    x = 627,346.67/939.26
  6. Step 6: Final answer
    x = 667.92

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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.