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Finding the Fourth Proportional to 519.95, 717.59 and 388.73

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Solution

The fourth proportional to 519.95, 717.59 and 388.73 is: 536.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.95 : 717.59 = 388.73 : x
  2. Step 2: Convert to fraction form
    519.95/717.59 = 388.73/x
  3. Step 3: Cross multiply
    519.95x = 717.59 × 388.73
  4. Step 4: Simplify right side
    519.95x = 278,946.82
  5. Step 5: Solve for x
    x = 278,946.82/519.95
  6. Step 6: Final answer
    x = 536.49

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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.