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Finding the Fourth Proportional to 859.64, 1,290.26 and 426.82

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Solution

The fourth proportional to 859.64, 1,290.26 and 426.82 is: 640.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.64 : 1,290.26 = 426.82 : x
  2. Step 2: Convert to fraction form
    859.64/1,290.26 = 426.82/x
  3. Step 3: Cross multiply
    859.64x = 1,290.26 × 426.82
  4. Step 4: Simplify right side
    859.64x = 550,708.77
  5. Step 5: Solve for x
    x = 550,708.77/859.64
  6. Step 6: Final answer
    x = 640.63

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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.