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Finding the Fourth Proportional to 427.85, 644.03 and 365.21

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Solution

The fourth proportional to 427.85, 644.03 and 365.21 is: 549.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.85 : 644.03 = 365.21 : x
  2. Step 2: Convert to fraction form
    427.85/644.03 = 365.21/x
  3. Step 3: Cross multiply
    427.85x = 644.03 × 365.21
  4. Step 4: Simplify right side
    427.85x = 235,202.98
  5. Step 5: Solve for x
    x = 235,202.98/427.85
  6. Step 6: Final answer
    x = 549.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.