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Finding the Fourth Proportional to 859.13, 1,288.96 and 311.37

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Solution

The fourth proportional to 859.13, 1,288.96 and 311.37 is: 467.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.13 : 1,288.96 = 311.37 : x
  2. Step 2: Convert to fraction form
    859.13/1,288.96 = 311.37/x
  3. Step 3: Cross multiply
    859.13x = 1,288.96 × 311.37
  4. Step 4: Simplify right side
    859.13x = 401,343.48
  5. Step 5: Solve for x
    x = 401,343.48/859.13
  6. Step 6: Final answer
    x = 467.15

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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.