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Finding the Fourth Proportional to 511.11, 705.31 and 290.05

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Solution

The fourth proportional to 511.11, 705.31 and 290.05 is: 400.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.11 : 705.31 = 290.05 : x
  2. Step 2: Convert to fraction form
    511.11/705.31 = 290.05/x
  3. Step 3: Cross multiply
    511.11x = 705.31 × 290.05
  4. Step 4: Simplify right side
    511.11x = 204,572.68
  5. Step 5: Solve for x
    x = 204,572.68/511.11
  6. Step 6: Final answer
    x = 400.25

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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.