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Finding the Fourth Proportional to 928.99, 1,393.71 and 381.57

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Solution

The fourth proportional to 928.99, 1,393.71 and 381.57 is: 572.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.99 : 1,393.71 = 381.57 : x
  2. Step 2: Convert to fraction form
    928.99/1,393.71 = 381.57/x
  3. Step 3: Cross multiply
    928.99x = 1,393.71 × 381.57
  4. Step 4: Simplify right side
    928.99x = 531,797.92
  5. Step 5: Solve for x
    x = 531,797.92/928.99
  6. Step 6: Final answer
    x = 572.45

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Double scale
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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.