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Finding the Fourth Proportional to 511.28, 705.56 and 290.28

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Solution

The fourth proportional to 511.28, 705.56 and 290.28 is: 400.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.28 : 705.56 = 290.28 : x
  2. Step 2: Convert to fraction form
    511.28/705.56 = 290.28/x
  3. Step 3: Cross multiply
    511.28x = 705.56 × 290.28
  4. Step 4: Simplify right side
    511.28x = 204,809.96
  5. Step 5: Solve for x
    x = 204,809.96/511.28
  6. Step 6: Final answer
    x = 400.58

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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.