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Finding the Fourth Proportional to 858.73, 1,288.20 and 311.17

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Solution

The fourth proportional to 858.73, 1,288.20 and 311.17 is: 466.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.73 : 1,288.20 = 311.17 : x
  2. Step 2: Convert to fraction form
    858.73/1,288.20 = 311.17/x
  3. Step 3: Cross multiply
    858.73x = 1,288.20 × 311.17
  4. Step 4: Simplify right side
    858.73x = 400,847.64
  5. Step 5: Solve for x
    x = 400,847.64/858.73
  6. Step 6: Final answer
    x = 466.79

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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.