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Finding the Fourth Proportional to 511.43, 705.81 and 290.42

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Solution

The fourth proportional to 511.43, 705.81 and 290.42 is: 400.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.43 : 705.81 = 290.42 : x
  2. Step 2: Convert to fraction form
    511.43/705.81 = 290.42/x
  3. Step 3: Cross multiply
    511.43x = 705.81 × 290.42
  4. Step 4: Simplify right side
    511.43x = 204,977.81
  5. Step 5: Solve for x
    x = 204,977.81/511.43
  6. Step 6: Final answer
    x = 400.80

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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.