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Finding the Fourth Proportional to 519.28, 717.08 and 388.06

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Solution

The fourth proportional to 519.28, 717.08 and 388.06 is: 535.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.28 : 717.08 = 388.06 : x
  2. Step 2: Convert to fraction form
    519.28/717.08 = 388.06/x
  3. Step 3: Cross multiply
    519.28x = 717.08 × 388.06
  4. Step 4: Simplify right side
    519.28x = 278,270.06
  5. Step 5: Solve for x
    x = 278,270.06/519.28
  6. Step 6: Final answer
    x = 535.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.