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Finding the Fourth Proportional to 859.46, 1,289.25 and 426.50

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Solution

The fourth proportional to 859.46, 1,289.25 and 426.50 is: 639.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.46 : 1,289.25 = 426.50 : x
  2. Step 2: Convert to fraction form
    859.46/1,289.25 = 426.50/x
  3. Step 3: Cross multiply
    859.46x = 1,289.25 × 426.50
  4. Step 4: Simplify right side
    859.46x = 549,865.13
  5. Step 5: Solve for x
    x = 549,865.13/859.46
  6. Step 6: Final answer
    x = 639.78

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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.