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Finding the Fourth Proportional to 825.92, 1,139.76 and 476.64

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Solution

The fourth proportional to 825.92, 1,139.76 and 476.64 is: 657.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.92 : 1,139.76 = 476.64 : x
  2. Step 2: Convert to fraction form
    825.92/1,139.76 = 476.64/x
  3. Step 3: Cross multiply
    825.92x = 1,139.76 × 476.64
  4. Step 4: Simplify right side
    825.92x = 543,255.21
  5. Step 5: Solve for x
    x = 543,255.21/825.92
  6. Step 6: Final answer
    x = 657.76

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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.