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Finding the Fourth Proportional to 511.78, 705.90 and 387.04

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Solution

The fourth proportional to 511.78, 705.90 and 387.04 is: 533.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.78 : 705.90 = 387.04 : x
  2. Step 2: Convert to fraction form
    511.78/705.90 = 387.04/x
  3. Step 3: Cross multiply
    511.78x = 705.90 × 387.04
  4. Step 4: Simplify right side
    511.78x = 273,211.54
  5. Step 5: Solve for x
    x = 273,211.54/511.78
  6. Step 6: Final answer
    x = 533.85

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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.