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Finding the Fourth Proportional to 611.22, 916.88 and 221.45

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Solution

The fourth proportional to 611.22, 916.88 and 221.45 is: 332.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.22 : 916.88 = 221.45 : x
  2. Step 2: Convert to fraction form
    611.22/916.88 = 221.45/x
  3. Step 3: Cross multiply
    611.22x = 916.88 × 221.45
  4. Step 4: Simplify right side
    611.22x = 203,041.97
  5. Step 5: Solve for x
    x = 203,041.97/611.22
  6. Step 6: Final answer
    x = 332.19

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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.