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Finding the Fourth Proportional to 385.60, 577.86 and 211.82

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Solution

The fourth proportional to 385.60, 577.86 and 211.82 is: 317.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.60 : 577.86 = 211.82 : x
  2. Step 2: Convert to fraction form
    385.60/577.86 = 211.82/x
  3. Step 3: Cross multiply
    385.60x = 577.86 × 211.82
  4. Step 4: Simplify right side
    385.60x = 122,402.31
  5. Step 5: Solve for x
    x = 122,402.31/385.60
  6. Step 6: Final answer
    x = 317.43

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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.