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Finding the Fourth Proportional to 859.87, 1,288.72 and 372.39

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Solution

The fourth proportional to 859.87, 1,288.72 and 372.39 is: 558.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.87 : 1,288.72 = 372.39 : x
  2. Step 2: Convert to fraction form
    859.87/1,288.72 = 372.39/x
  3. Step 3: Cross multiply
    859.87x = 1,288.72 × 372.39
  4. Step 4: Simplify right side
    859.87x = 479,906.44
  5. Step 5: Solve for x
    x = 479,906.44/859.87
  6. Step 6: Final answer
    x = 558.12

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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.