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Finding the Fourth Proportional to 858.36, 1,286.88 and 425.18

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Solution

The fourth proportional to 858.36, 1,286.88 and 425.18 is: 637.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.36 : 1,286.88 = 425.18 : x
  2. Step 2: Convert to fraction form
    858.36/1,286.88 = 425.18/x
  3. Step 3: Cross multiply
    858.36x = 1,286.88 × 425.18
  4. Step 4: Simplify right side
    858.36x = 547,155.64
  5. Step 5: Solve for x
    x = 547,155.64/858.36
  6. Step 6: Final answer
    x = 637.44

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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.