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Finding the Fourth Proportional to 928.27, 1,392.41 and 380.45

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Solution

The fourth proportional to 928.27, 1,392.41 and 380.45 is: 570.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.27 : 1,392.41 = 380.45 : x
  2. Step 2: Convert to fraction form
    928.27/1,392.41 = 380.45/x
  3. Step 3: Cross multiply
    928.27x = 1,392.41 × 380.45
  4. Step 4: Simplify right side
    928.27x = 529,746.82
  5. Step 5: Solve for x
    x = 529,746.82/928.27
  6. Step 6: Final answer
    x = 570.68

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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.