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Finding the Fourth Proportional to 857.72, 1,286.10 and 584.18

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Solution

The fourth proportional to 857.72, 1,286.10 and 584.18 is: 875.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.72 : 1,286.10 = 584.18 : x
  2. Step 2: Convert to fraction form
    857.72/1,286.10 = 584.18/x
  3. Step 3: Cross multiply
    857.72x = 1,286.10 × 584.18
  4. Step 4: Simplify right side
    857.72x = 751,313.90
  5. Step 5: Solve for x
    x = 751,313.90/857.72
  6. Step 6: Final answer
    x = 875.94

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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.