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Finding the Fourth Proportional to 928.69, 1,393.25 and 279.43

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Solution

The fourth proportional to 928.69, 1,393.25 and 279.43 is: 419.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.69 : 1,393.25 = 279.43 : x
  2. Step 2: Convert to fraction form
    928.69/1,393.25 = 279.43/x
  3. Step 3: Cross multiply
    928.69x = 1,393.25 × 279.43
  4. Step 4: Simplify right side
    928.69x = 389,310.97
  5. Step 5: Solve for x
    x = 389,310.97/928.69
  6. Step 6: Final answer
    x = 419.21

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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.