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Finding the Fourth Proportional to 928.35, 1,392.98 and 380.69

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Solution

The fourth proportional to 928.35, 1,392.98 and 380.69 is: 571.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.35 : 1,392.98 = 380.69 : x
  2. Step 2: Convert to fraction form
    928.35/1,392.98 = 380.69/x
  3. Step 3: Cross multiply
    928.35x = 1,392.98 × 380.69
  4. Step 4: Simplify right side
    928.35x = 530,293.56
  5. Step 5: Solve for x
    x = 530,293.56/928.35
  6. Step 6: Final answer
    x = 571.22

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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.