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Finding the Fourth Proportional to 825.67, 1,139.63 and 560.56

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Solution

The fourth proportional to 825.67, 1,139.63 and 560.56 is: 773.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.67 : 1,139.63 = 560.56 : x
  2. Step 2: Convert to fraction form
    825.67/1,139.63 = 560.56/x
  3. Step 3: Cross multiply
    825.67x = 1,139.63 × 560.56
  4. Step 4: Simplify right side
    825.67x = 638,822.49
  5. Step 5: Solve for x
    x = 638,822.49/825.67
  6. Step 6: Final answer
    x = 773.71

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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.