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Finding the Fourth Proportional to 549.20, 756.68 and 451.28

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Solution

The fourth proportional to 549.20, 756.68 and 451.28 is: 621.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.20 : 756.68 = 451.28 : x
  2. Step 2: Convert to fraction form
    549.20/756.68 = 451.28/x
  3. Step 3: Cross multiply
    549.20x = 756.68 × 451.28
  4. Step 4: Simplify right side
    549.20x = 341,474.55
  5. Step 5: Solve for x
    x = 341,474.55/549.20
  6. Step 6: Final answer
    x = 621.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.