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Finding the Fourth Proportional to 930.20, 1,394.10 and 381.72

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Solution

The fourth proportional to 930.20, 1,394.10 and 381.72 is: 572.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.20 : 1,394.10 = 381.72 : x
  2. Step 2: Convert to fraction form
    930.20/1,394.10 = 381.72/x
  3. Step 3: Cross multiply
    930.20x = 1,394.10 × 381.72
  4. Step 4: Simplify right side
    930.20x = 532,155.85
  5. Step 5: Solve for x
    x = 532,155.85/930.20
  6. Step 6: Final answer
    x = 572.09

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1.5x scale

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.