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Finding the Fourth Proportional to 495.17, 742.55 and 221.21

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Solution

The fourth proportional to 495.17, 742.55 and 221.21 is: 331.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.17 : 742.55 = 221.21 : x
  2. Step 2: Convert to fraction form
    495.17/742.55 = 221.21/x
  3. Step 3: Cross multiply
    495.17x = 742.55 × 221.21
  4. Step 4: Simplify right side
    495.17x = 164,254.67
  5. Step 5: Solve for x
    x = 164,254.67/495.17
  6. Step 6: Final answer
    x = 331.72

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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.