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Finding the Fourth Proportional to 859.85, 1,288.95 and 426.77

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Solution

The fourth proportional to 859.85, 1,288.95 and 426.77 is: 639.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.85 : 1,288.95 = 426.77 : x
  2. Step 2: Convert to fraction form
    859.85/1,288.95 = 426.77/x
  3. Step 3: Cross multiply
    859.85x = 1,288.95 × 426.77
  4. Step 4: Simplify right side
    859.85x = 550,078.75
  5. Step 5: Solve for x
    x = 550,078.75/859.85
  6. Step 6: Final answer
    x = 639.74

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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.