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Finding the Fourth Proportional to 853.82, 1,280.72 and 579.23

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Solution

The fourth proportional to 853.82, 1,280.72 and 579.23 is: 868.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.82 : 1,280.72 = 579.23 : x
  2. Step 2: Convert to fraction form
    853.82/1,280.72 = 579.23/x
  3. Step 3: Cross multiply
    853.82x = 1,280.72 × 579.23
  4. Step 4: Simplify right side
    853.82x = 741,831.45
  5. Step 5: Solve for x
    x = 741,831.45/853.82
  6. Step 6: Final answer
    x = 868.84

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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.