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Finding the Fourth Proportional to 611.08, 916.21 and 220.89

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Solution

The fourth proportional to 611.08, 916.21 and 220.89 is: 331.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.08 : 916.21 = 220.89 : x
  2. Step 2: Convert to fraction form
    611.08/916.21 = 220.89/x
  3. Step 3: Cross multiply
    611.08x = 916.21 × 220.89
  4. Step 4: Simplify right side
    611.08x = 202,385.34
  5. Step 5: Solve for x
    x = 202,385.34/611.08
  6. Step 6: Final answer
    x = 331.19

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Double scale
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Similar ratio
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1.5x scale

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.