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Finding the Fourth Proportional to 498.09, 685.08 and 399.63

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Solution

The fourth proportional to 498.09, 685.08 and 399.63 is: 549.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.09 : 685.08 = 399.63 : x
  2. Step 2: Convert to fraction form
    498.09/685.08 = 399.63/x
  3. Step 3: Cross multiply
    498.09x = 685.08 × 399.63
  4. Step 4: Simplify right side
    498.09x = 273,778.52
  5. Step 5: Solve for x
    x = 273,778.52/498.09
  6. Step 6: Final answer
    x = 549.66

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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.