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Finding the Fourth Proportional to 257.22, 386.19 and 221.13

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Solution

The fourth proportional to 257.22, 386.19 and 221.13 is: 332.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.22 : 386.19 = 221.13 : x
  2. Step 2: Convert to fraction form
    257.22/386.19 = 221.13/x
  3. Step 3: Cross multiply
    257.22x = 386.19 × 221.13
  4. Step 4: Simplify right side
    257.22x = 85,398.19
  5. Step 5: Solve for x
    x = 85,398.19/257.22
  6. Step 6: Final answer
    x = 332.00

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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.