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Finding the Fourth Proportional to 385.18, 577.32 and 231.22

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Solution

The fourth proportional to 385.18, 577.32 and 231.22 is: 346.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.18 : 577.32 = 231.22 : x
  2. Step 2: Convert to fraction form
    385.18/577.32 = 231.22/x
  3. Step 3: Cross multiply
    385.18x = 577.32 × 231.22
  4. Step 4: Simplify right side
    385.18x = 133,487.93
  5. Step 5: Solve for x
    x = 133,487.93/385.18
  6. Step 6: Final answer
    x = 346.56

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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.