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Finding the Fourth Proportional to 549.12, 819.64 and 485.04

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Solution

The fourth proportional to 549.12, 819.64 and 485.04 is: 723.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.12 : 819.64 = 485.04 : x
  2. Step 2: Convert to fraction form
    549.12/819.64 = 485.04/x
  3. Step 3: Cross multiply
    549.12x = 819.64 × 485.04
  4. Step 4: Simplify right side
    549.12x = 397,558.19
  5. Step 5: Solve for x
    x = 397,558.19/549.12
  6. Step 6: Final answer
    x = 723.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.