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Finding the Fourth Proportional to 579.76, 868.86 and 214.20

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Solution

The fourth proportional to 579.76, 868.86 and 214.20 is: 321.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.76 : 868.86 = 214.20 : x
  2. Step 2: Convert to fraction form
    579.76/868.86 = 214.20/x
  3. Step 3: Cross multiply
    579.76x = 868.86 × 214.20
  4. Step 4: Simplify right side
    579.76x = 186,109.81
  5. Step 5: Solve for x
    x = 186,109.81/579.76
  6. Step 6: Final answer
    x = 321.01

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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.