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Finding the Fourth Proportional to 1,288.97, 1,779.21 and 757.83

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Solution

The fourth proportional to 1,288.97, 1,779.21 and 757.83 is: 1,046.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.97 : 1,779.21 = 757.83 : x
  2. Step 2: Convert to fraction form
    1,288.97/1,779.21 = 757.83/x
  3. Step 3: Cross multiply
    1,288.97x = 1,779.21 × 757.83
  4. Step 4: Simplify right side
    1,288.97x = 1,348,337.55
  5. Step 5: Solve for x
    x = 1,348,337.55/1,288.97
  6. Step 6: Final answer
    x = 1,046.06

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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.