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Finding the Fourth Proportional to 519.29, 716.47 and 309.45

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Solution

The fourth proportional to 519.29, 716.47 and 309.45 is: 426.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.29 : 716.47 = 309.45 : x
  2. Step 2: Convert to fraction form
    519.29/716.47 = 309.45/x
  3. Step 3: Cross multiply
    519.29x = 716.47 × 309.45
  4. Step 4: Simplify right side
    519.29x = 221,711.64
  5. Step 5: Solve for x
    x = 221,711.64/519.29
  6. Step 6: Final answer
    x = 426.95

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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.