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Finding the Fourth Proportional to 549.36, 821.84 and 458.20

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Solution

The fourth proportional to 549.36, 821.84 and 458.20 is: 685.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.36 : 821.84 = 458.20 : x
  2. Step 2: Convert to fraction form
    549.36/821.84 = 458.20/x
  3. Step 3: Cross multiply
    549.36x = 821.84 × 458.20
  4. Step 4: Simplify right side
    549.36x = 376,567.09
  5. Step 5: Solve for x
    x = 376,567.09/549.36
  6. Step 6: Final answer
    x = 685.47

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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.