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Finding the Fourth Proportional to 572.49, 858.78 and 221.22

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Solution

The fourth proportional to 572.49, 858.78 and 221.22 is: 331.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.49 : 858.78 = 221.22 : x
  2. Step 2: Convert to fraction form
    572.49/858.78 = 221.22/x
  3. Step 3: Cross multiply
    572.49x = 858.78 × 221.22
  4. Step 4: Simplify right side
    572.49x = 189,979.31
  5. Step 5: Solve for x
    x = 189,979.31/572.49
  6. Step 6: Final answer
    x = 331.85

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Double scale
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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.