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Finding the Fourth Proportional to 511.59, 705.96 and 287.49

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Solution

The fourth proportional to 511.59, 705.96 and 287.49 is: 396.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.59 : 705.96 = 287.49 : x
  2. Step 2: Convert to fraction form
    511.59/705.96 = 287.49/x
  3. Step 3: Cross multiply
    511.59x = 705.96 × 287.49
  4. Step 4: Simplify right side
    511.59x = 202,956.29
  5. Step 5: Solve for x
    x = 202,956.29/511.59
  6. Step 6: Final answer
    x = 396.72

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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.