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Finding the Fourth Proportional to 511.34, 705.60 and 287.28

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Solution

The fourth proportional to 511.34, 705.60 and 287.28 is: 396.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.34 : 705.60 = 287.28 : x
  2. Step 2: Convert to fraction form
    511.34/705.60 = 287.28/x
  3. Step 3: Cross multiply
    511.34x = 705.60 × 287.28
  4. Step 4: Simplify right side
    511.34x = 202,704.77
  5. Step 5: Solve for x
    x = 202,704.77/511.34
  6. Step 6: Final answer
    x = 396.42

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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.