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Finding the Fourth Proportional to 519.12, 716.40 and 309.24

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Solution

The fourth proportional to 519.12, 716.40 and 309.24 is: 426.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.12 : 716.40 = 309.24 : x
  2. Step 2: Convert to fraction form
    519.12/716.40 = 309.24/x
  3. Step 3: Cross multiply
    519.12x = 716.40 × 309.24
  4. Step 4: Simplify right side
    519.12x = 221,539.54
  5. Step 5: Solve for x
    x = 221,539.54/519.12
  6. Step 6: Final answer
    x = 426.76

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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.