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Finding the Fourth Proportional to 825.32, 1,138.92 and 447.20

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Solution

The fourth proportional to 825.32, 1,138.92 and 447.20 is: 617.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.32 : 1,138.92 = 447.20 : x
  2. Step 2: Convert to fraction form
    825.32/1,138.92 = 447.20/x
  3. Step 3: Cross multiply
    825.32x = 1,138.92 × 447.20
  4. Step 4: Simplify right side
    825.32x = 509,329.55
  5. Step 5: Solve for x
    x = 509,329.55/825.32
  6. Step 6: Final answer
    x = 617.13

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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.