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Finding the Fourth Proportional to 859.10, 1,288.62 and 209.82

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Solution

The fourth proportional to 859.10, 1,288.62 and 209.82 is: 314.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.10 : 1,288.62 = 209.82 : x
  2. Step 2: Convert to fraction form
    859.10/1,288.62 = 209.82/x
  3. Step 3: Cross multiply
    859.10x = 1,288.62 × 209.82
  4. Step 4: Simplify right side
    859.10x = 270,378.25
  5. Step 5: Solve for x
    x = 270,378.25/859.10
  6. Step 6: Final answer
    x = 314.72

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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.