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Finding the Fourth Proportional to 511.12, 705.31 and 287.04

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Solution

The fourth proportional to 511.12, 705.31 and 287.04 is: 396.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.12 : 705.31 = 287.04 : x
  2. Step 2: Convert to fraction form
    511.12/705.31 = 287.04/x
  3. Step 3: Cross multiply
    511.12x = 705.31 × 287.04
  4. Step 4: Simplify right side
    511.12x = 202,452.18
  5. Step 5: Solve for x
    x = 202,452.18/511.12
  6. Step 6: Final answer
    x = 396.10

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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.