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Finding the Fourth Proportional to 549.56, 823.56 and 427.28

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Solution

The fourth proportional to 549.56, 823.56 and 427.28 is: 640.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.56 : 823.56 = 427.28 : x
  2. Step 2: Convert to fraction form
    549.56/823.56 = 427.28/x
  3. Step 3: Cross multiply
    549.56x = 823.56 × 427.28
  4. Step 4: Simplify right side
    549.56x = 351,890.72
  5. Step 5: Solve for x
    x = 351,890.72/549.56
  6. Step 6: Final answer
    x = 640.31

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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.