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Finding the Fourth Proportional to 859.20, 1,288.28 and 338.82

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Solution

The fourth proportional to 859.20, 1,288.28 and 338.82 is: 508.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.20 : 1,288.28 = 338.82 : x
  2. Step 2: Convert to fraction form
    859.20/1,288.28 = 338.82/x
  3. Step 3: Cross multiply
    859.20x = 1,288.28 × 338.82
  4. Step 4: Simplify right side
    859.20x = 436,495.03
  5. Step 5: Solve for x
    x = 436,495.03/859.20
  6. Step 6: Final answer
    x = 508.02

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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.