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Finding the Fourth Proportional to 579.85, 870.03 and 214.55

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Solution

The fourth proportional to 579.85, 870.03 and 214.55 is: 321.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.85 : 870.03 = 214.55 : x
  2. Step 2: Convert to fraction form
    579.85/870.03 = 214.55/x
  3. Step 3: Cross multiply
    579.85x = 870.03 × 214.55
  4. Step 4: Simplify right side
    579.85x = 186,664.94
  5. Step 5: Solve for x
    x = 186,664.94/579.85
  6. Step 6: Final answer
    x = 321.92

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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.