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Finding the Fourth Proportional to 857.74, 1,286.19 and 424.39

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Solution

The fourth proportional to 857.74, 1,286.19 and 424.39 is: 636.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.74 : 1,286.19 = 424.39 : x
  2. Step 2: Convert to fraction form
    857.74/1,286.19 = 424.39/x
  3. Step 3: Cross multiply
    857.74x = 1,286.19 × 424.39
  4. Step 4: Simplify right side
    857.74x = 545,846.17
  5. Step 5: Solve for x
    x = 545,846.17/857.74
  6. Step 6: Final answer
    x = 636.38

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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.