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Finding the Fourth Proportional to 385.36, 577.89 and 221.06

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Solution

The fourth proportional to 385.36, 577.89 and 221.06 is: 331.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.36 : 577.89 = 221.06 : x
  2. Step 2: Convert to fraction form
    385.36/577.89 = 221.06/x
  3. Step 3: Cross multiply
    385.36x = 577.89 × 221.06
  4. Step 4: Simplify right side
    385.36x = 127,748.36
  5. Step 5: Solve for x
    x = 127,748.36/385.36
  6. Step 6: Final answer
    x = 331.50

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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.