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Finding the Fourth Proportional to 511.80, 706.62 and 387.73

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Solution

The fourth proportional to 511.80, 706.62 and 387.73 is: 535.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.80 : 706.62 = 387.73 : x
  2. Step 2: Convert to fraction form
    511.80/706.62 = 387.73/x
  3. Step 3: Cross multiply
    511.80x = 706.62 × 387.73
  4. Step 4: Simplify right side
    511.80x = 273,977.77
  5. Step 5: Solve for x
    x = 273,977.77/511.80
  6. Step 6: Final answer
    x = 535.32

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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.