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Finding the Fourth Proportional to 859.20, 1,285.55 and 571.20

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Solution

The fourth proportional to 859.20, 1,285.55 and 571.20 is: 854.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.20 : 1,285.55 = 571.20 : x
  2. Step 2: Convert to fraction form
    859.20/1,285.55 = 571.20/x
  3. Step 3: Cross multiply
    859.20x = 1,285.55 × 571.20
  4. Step 4: Simplify right side
    859.20x = 734,306.16
  5. Step 5: Solve for x
    x = 734,306.16/859.20
  6. Step 6: Final answer
    x = 854.64

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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.