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Finding the Fourth Proportional to 689.21, 951.11 and 394.48

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Solution

The fourth proportional to 689.21, 951.11 and 394.48 is: 544.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.21 : 951.11 = 394.48 : x
  2. Step 2: Convert to fraction form
    689.21/951.11 = 394.48/x
  3. Step 3: Cross multiply
    689.21x = 951.11 × 394.48
  4. Step 4: Simplify right side
    689.21x = 375,193.87
  5. Step 5: Solve for x
    x = 375,193.87/689.21
  6. Step 6: Final answer
    x = 544.38

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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.