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Finding the Fourth Proportional to 1,139.56, 1,571.56 and 826.88

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Solution

The fourth proportional to 1,139.56, 1,571.56 and 826.88 is: 1,140.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.56 : 1,571.56 = 826.88 : x
  2. Step 2: Convert to fraction form
    1,139.56/1,571.56 = 826.88/x
  3. Step 3: Cross multiply
    1,139.56x = 1,571.56 × 826.88
  4. Step 4: Simplify right side
    1,139.56x = 1,299,491.53
  5. Step 5: Solve for x
    x = 1,299,491.53/1,139.56
  6. Step 6: Final answer
    x = 1,140.34

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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.