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Finding the Fourth Proportional to 385.14, 577.21 and 211.87

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Solution

The fourth proportional to 385.14, 577.21 and 211.87 is: 317.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.14 : 577.21 = 211.87 : x
  2. Step 2: Convert to fraction form
    385.14/577.21 = 211.87/x
  3. Step 3: Cross multiply
    385.14x = 577.21 × 211.87
  4. Step 4: Simplify right side
    385.14x = 122,293.48
  5. Step 5: Solve for x
    x = 122,293.48/385.14
  6. Step 6: Final answer
    x = 317.53

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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.