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Finding the Fourth Proportional to 512.87, 707.78 and 291.83

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Solution

The fourth proportional to 512.87, 707.78 and 291.83 is: 402.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.87 : 707.78 = 291.83 : x
  2. Step 2: Convert to fraction form
    512.87/707.78 = 291.83/x
  3. Step 3: Cross multiply
    512.87x = 707.78 × 291.83
  4. Step 4: Simplify right side
    512.87x = 206,551.44
  5. Step 5: Solve for x
    x = 206,551.44/512.87
  6. Step 6: Final answer
    x = 402.74

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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.