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Finding the Fourth Proportional to 1,139.37, 1,709.09 and 751.85

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Solution

The fourth proportional to 1,139.37, 1,709.09 and 751.85 is: 1,127.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.37 : 1,709.09 = 751.85 : x
  2. Step 2: Convert to fraction form
    1,139.37/1,709.09 = 751.85/x
  3. Step 3: Cross multiply
    1,139.37x = 1,709.09 × 751.85
  4. Step 4: Simplify right side
    1,139.37x = 1,284,983.59
  5. Step 5: Solve for x
    x = 1,284,983.59/1,139.37
  6. Step 6: Final answer
    x = 1,127.80

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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.