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Finding the Fourth Proportional to 520.05, 717.72 and 388.83

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Solution

The fourth proportional to 520.05, 717.72 and 388.83 is: 536.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.05 : 717.72 = 388.83 : x
  2. Step 2: Convert to fraction form
    520.05/717.72 = 388.83/x
  3. Step 3: Cross multiply
    520.05x = 717.72 × 388.83
  4. Step 4: Simplify right side
    520.05x = 279,067.48
  5. Step 5: Solve for x
    x = 279,067.48/520.05
  6. Step 6: Final answer
    x = 536.62

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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.