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Finding the Fourth Proportional to 611.24, 916.86 and 216.22

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Solution

The fourth proportional to 611.24, 916.86 and 216.22 is: 324.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.24 : 916.86 = 216.22 : x
  2. Step 2: Convert to fraction form
    611.24/916.86 = 216.22/x
  3. Step 3: Cross multiply
    611.24x = 916.86 × 216.22
  4. Step 4: Simplify right side
    611.24x = 198,241.13
  5. Step 5: Solve for x
    x = 198,241.13/611.24
  6. Step 6: Final answer
    x = 324.32

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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.