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Finding the Fourth Proportional to 859.11, 1,288.80 and 567.20

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Solution

The fourth proportional to 859.11, 1,288.80 and 567.20 is: 850.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.11 : 1,288.80 = 567.20 : x
  2. Step 2: Convert to fraction form
    859.11/1,288.80 = 567.20/x
  3. Step 3: Cross multiply
    859.11x = 1,288.80 × 567.20
  4. Step 4: Simplify right side
    859.11x = 731,000.92
  5. Step 5: Solve for x
    x = 731,000.92/859.11
  6. Step 6: Final answer
    x = 850.88

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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.