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Finding the Fourth Proportional to 858.35, 1,286.70 and 425.27

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Solution

The fourth proportional to 858.35, 1,286.70 and 425.27 is: 637.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.35 : 1,286.70 = 425.27 : x
  2. Step 2: Convert to fraction form
    858.35/1,286.70 = 425.27/x
  3. Step 3: Cross multiply
    858.35x = 1,286.70 × 425.27
  4. Step 4: Simplify right side
    858.35x = 547,188.48
  5. Step 5: Solve for x
    x = 547,188.48/858.35
  6. Step 6: Final answer
    x = 637.49

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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.