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Finding the Fourth Proportional to 518.92, 715.86 and 309

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Solution

The fourth proportional to 518.92, 715.86 and 309 is: 426.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.92 : 715.86 = 309 : x
  2. Step 2: Convert to fraction form
    518.92/715.86 = 309/x
  3. Step 3: Cross multiply
    518.92x = 715.86 × 309
  4. Step 4: Simplify right side
    518.92x = 221,200.74
  5. Step 5: Solve for x
    x = 221,200.74/518.92
  6. Step 6: Final answer
    x = 426.27

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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.