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Finding the Fourth Proportional to 1,139.49, 1,707.57 and 896.49

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Solution

The fourth proportional to 1,139.49, 1,707.57 and 896.49 is: 1,343.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.49 : 1,707.57 = 896.49 : x
  2. Step 2: Convert to fraction form
    1,139.49/1,707.57 = 896.49/x
  3. Step 3: Cross multiply
    1,139.49x = 1,707.57 × 896.49
  4. Step 4: Simplify right side
    1,139.49x = 1,530,819.43
  5. Step 5: Solve for x
    x = 1,530,819.43/1,139.49
  6. Step 6: Final answer
    x = 1,343.43

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1.5x scale

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.