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Finding the Fourth Proportional to 511.69, 706.15 and 290.66

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Solution

The fourth proportional to 511.69, 706.15 and 290.66 is: 401.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.69 : 706.15 = 290.66 : x
  2. Step 2: Convert to fraction form
    511.69/706.15 = 290.66/x
  3. Step 3: Cross multiply
    511.69x = 706.15 × 290.66
  4. Step 4: Simplify right side
    511.69x = 205,249.56
  5. Step 5: Solve for x
    x = 205,249.56/511.69
  6. Step 6: Final answer
    x = 401.12

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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.