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Finding the Fourth Proportional to 859.52, 1,287.96 and 426.92

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Solution

The fourth proportional to 859.52, 1,287.96 and 426.92 is: 639.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.52 : 1,287.96 = 426.92 : x
  2. Step 2: Convert to fraction form
    859.52/1,287.96 = 426.92/x
  3. Step 3: Cross multiply
    859.52x = 1,287.96 × 426.92
  4. Step 4: Simplify right side
    859.52x = 549,855.88
  5. Step 5: Solve for x
    x = 549,855.88/859.52
  6. Step 6: Final answer
    x = 639.72

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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.