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Finding the Fourth Proportional to 857.20, 1,286.26 and 446.70

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Solution

The fourth proportional to 857.20, 1,286.26 and 446.70 is: 670.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.20 : 1,286.26 = 446.70 : x
  2. Step 2: Convert to fraction form
    857.20/1,286.26 = 446.70/x
  3. Step 3: Cross multiply
    857.20x = 1,286.26 × 446.70
  4. Step 4: Simplify right side
    857.20x = 574,572.34
  5. Step 5: Solve for x
    x = 574,572.34/857.20
  6. Step 6: Final answer
    x = 670.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.