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Finding the Fourth Proportional to 399.06, 549.60 and 343.80

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Solution

The fourth proportional to 399.06, 549.60 and 343.80 is: 473.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.06 : 549.60 = 343.80 : x
  2. Step 2: Convert to fraction form
    399.06/549.60 = 343.80/x
  3. Step 3: Cross multiply
    399.06x = 549.60 × 343.80
  4. Step 4: Simplify right side
    399.06x = 188,952.48
  5. Step 5: Solve for x
    x = 188,952.48/399.06
  6. Step 6: Final answer
    x = 473.49

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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.