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Finding the Fourth Proportional to 825.67, 1,139.48 and 471.61

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Solution

The fourth proportional to 825.67, 1,139.48 and 471.61 is: 650.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.67 : 1,139.48 = 471.61 : x
  2. Step 2: Convert to fraction form
    825.67/1,139.48 = 471.61/x
  3. Step 3: Cross multiply
    825.67x = 1,139.48 × 471.61
  4. Step 4: Simplify right side
    825.67x = 537,390.16
  5. Step 5: Solve for x
    x = 537,390.16/825.67
  6. Step 6: Final answer
    x = 650.85

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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.