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Finding the Fourth Proportional to 498.34, 685.43 and 399.88

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Solution

The fourth proportional to 498.34, 685.43 and 399.88 is: 550.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.34 : 685.43 = 399.88 : x
  2. Step 2: Convert to fraction form
    498.34/685.43 = 399.88/x
  3. Step 3: Cross multiply
    498.34x = 685.43 × 399.88
  4. Step 4: Simplify right side
    498.34x = 274,087.75
  5. Step 5: Solve for x
    x = 274,087.75/498.34
  6. Step 6: Final answer
    x = 550.00

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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.