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Finding the Fourth Proportional to 1,291.88, 1,936.92 and 511.32

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Solution

The fourth proportional to 1,291.88, 1,936.92 and 511.32 is: 766.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.88 : 1,936.92 = 511.32 : x
  2. Step 2: Convert to fraction form
    1,291.88/1,936.92 = 511.32/x
  3. Step 3: Cross multiply
    1,291.88x = 1,936.92 × 511.32
  4. Step 4: Simplify right side
    1,291.88x = 990,385.93
  5. Step 5: Solve for x
    x = 990,385.93/1,291.88
  6. Step 6: Final answer
    x = 766.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.