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Finding the Fourth Proportional to 357.80, 536.90 and 221.18

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Solution

The fourth proportional to 357.80, 536.90 and 221.18 is: 331.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.80 : 536.90 = 221.18 : x
  2. Step 2: Convert to fraction form
    357.80/536.90 = 221.18/x
  3. Step 3: Cross multiply
    357.80x = 536.90 × 221.18
  4. Step 4: Simplify right side
    357.80x = 118,747.75
  5. Step 5: Solve for x
    x = 118,747.75/357.80
  6. Step 6: Final answer
    x = 331.89

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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.