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Finding the Fourth Proportional to 579.60, 869.30 and 214.20

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Solution

The fourth proportional to 579.60, 869.30 and 214.20 is: 321.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.60 : 869.30 = 214.20 : x
  2. Step 2: Convert to fraction form
    579.60/869.30 = 214.20/x
  3. Step 3: Cross multiply
    579.60x = 869.30 × 214.20
  4. Step 4: Simplify right side
    579.60x = 186,204.06
  5. Step 5: Solve for x
    x = 186,204.06/579.60
  6. Step 6: Final answer
    x = 321.26

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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.