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Finding the Fourth Proportional to 1,139.35, 1,571.97 and 696.79

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Solution

The fourth proportional to 1,139.35, 1,571.97 and 696.79 is: 961.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.35 : 1,571.97 = 696.79 : x
  2. Step 2: Convert to fraction form
    1,139.35/1,571.97 = 696.79/x
  3. Step 3: Cross multiply
    1,139.35x = 1,571.97 × 696.79
  4. Step 4: Simplify right side
    1,139.35x = 1,095,332.98
  5. Step 5: Solve for x
    x = 1,095,332.98/1,139.35
  6. Step 6: Final answer
    x = 961.37

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1.5x scale

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.