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Finding the Fourth Proportional to 859.71, 1,289.57 and 426.77

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Solution

The fourth proportional to 859.71, 1,289.57 and 426.77 is: 640.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.71 : 1,289.57 = 426.77 : x
  2. Step 2: Convert to fraction form
    859.71/1,289.57 = 426.77/x
  3. Step 3: Cross multiply
    859.71x = 1,289.57 × 426.77
  4. Step 4: Simplify right side
    859.71x = 550,341.21
  5. Step 5: Solve for x
    x = 550,341.21/859.71
  6. Step 6: Final answer
    x = 640.15

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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.