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Finding the Fourth Proportional to 579.96, 869.93 and 141.21

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Solution

The fourth proportional to 579.96, 869.93 and 141.21 is: 211.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.96 : 869.93 = 141.21 : x
  2. Step 2: Convert to fraction form
    579.96/869.93 = 141.21/x
  3. Step 3: Cross multiply
    579.96x = 869.93 × 141.21
  4. Step 4: Simplify right side
    579.96x = 122,842.11
  5. Step 5: Solve for x
    x = 122,842.11/579.96
  6. Step 6: Final answer
    x = 211.81

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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.