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Finding the Fourth Proportional to 611.15, 916.18 and 221.06

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Solution

The fourth proportional to 611.15, 916.18 and 221.06 is: 331.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.15 : 916.18 = 221.06 : x
  2. Step 2: Convert to fraction form
    611.15/916.18 = 221.06/x
  3. Step 3: Cross multiply
    611.15x = 916.18 × 221.06
  4. Step 4: Simplify right side
    611.15x = 202,530.75
  5. Step 5: Solve for x
    x = 202,530.75/611.15
  6. Step 6: Final answer
    x = 331.39

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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.