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Finding the Fourth Proportional to 921.21, 1,378.38 and 549.66

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Solution

The fourth proportional to 921.21, 1,378.38 and 549.66 is: 822.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.21 : 1,378.38 = 549.66 : x
  2. Step 2: Convert to fraction form
    921.21/1,378.38 = 549.66/x
  3. Step 3: Cross multiply
    921.21x = 1,378.38 × 549.66
  4. Step 4: Simplify right side
    921.21x = 757,640.35
  5. Step 5: Solve for x
    x = 757,640.35/921.21
  6. Step 6: Final answer
    x = 822.44

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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.