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Finding the Fourth Proportional to 1,307.96, 1,961.93 and 759.85

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Solution

The fourth proportional to 1,307.96, 1,961.93 and 759.85 is: 1,139.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.96 : 1,961.93 = 759.85 : x
  2. Step 2: Convert to fraction form
    1,307.96/1,961.93 = 759.85/x
  3. Step 3: Cross multiply
    1,307.96x = 1,961.93 × 759.85
  4. Step 4: Simplify right side
    1,307.96x = 1,490,758.90
  5. Step 5: Solve for x
    x = 1,490,758.90/1,307.96
  6. Step 6: Final answer
    x = 1,139.76

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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.