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Finding the Fourth Proportional to 611.58, 917.17 and 221.53

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Solution

The fourth proportional to 611.58, 917.17 and 221.53 is: 332.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.58 : 917.17 = 221.53 : x
  2. Step 2: Convert to fraction form
    611.58/917.17 = 221.53/x
  3. Step 3: Cross multiply
    611.58x = 917.17 × 221.53
  4. Step 4: Simplify right side
    611.58x = 203,178.38
  5. Step 5: Solve for x
    x = 203,178.38/611.58
  6. Step 6: Final answer
    x = 332.22

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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.