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Finding the Fourth Proportional to 928.75, 1,394.07 and 381.25

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Solution

The fourth proportional to 928.75, 1,394.07 and 381.25 is: 572.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.75 : 1,394.07 = 381.25 : x
  2. Step 2: Convert to fraction form
    928.75/1,394.07 = 381.25/x
  3. Step 3: Cross multiply
    928.75x = 1,394.07 × 381.25
  4. Step 4: Simplify right side
    928.75x = 531,489.19
  5. Step 5: Solve for x
    x = 531,489.19/928.75
  6. Step 6: Final answer
    x = 572.26

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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.