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Finding the Fourth Proportional to 511.91, 706.43 and 290.87

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Solution

The fourth proportional to 511.91, 706.43 and 290.87 is: 401.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.91 : 706.43 = 290.87 : x
  2. Step 2: Convert to fraction form
    511.91/706.43 = 290.87/x
  3. Step 3: Cross multiply
    511.91x = 706.43 × 290.87
  4. Step 4: Simplify right side
    511.91x = 205,474.31
  5. Step 5: Solve for x
    x = 205,474.31/511.91
  6. Step 6: Final answer
    x = 401.39

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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.