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Finding the Fourth Proportional to 411.92, 619.32 and 339.92

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Solution

The fourth proportional to 411.92, 619.32 and 339.92 is: 511.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.92 : 619.32 = 339.92 : x
  2. Step 2: Convert to fraction form
    411.92/619.32 = 339.92/x
  3. Step 3: Cross multiply
    411.92x = 619.32 × 339.92
  4. Step 4: Simplify right side
    411.92x = 210,519.25
  5. Step 5: Solve for x
    x = 210,519.25/411.92
  6. Step 6: Final answer
    x = 511.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.