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Finding the Fourth Proportional to 498.58, 691.57 and 485.26

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Solution

The fourth proportional to 498.58, 691.57 and 485.26 is: 673.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.58 : 691.57 = 485.26 : x
  2. Step 2: Convert to fraction form
    498.58/691.57 = 485.26/x
  3. Step 3: Cross multiply
    498.58x = 691.57 × 485.26
  4. Step 4: Simplify right side
    498.58x = 335,591.26
  5. Step 5: Solve for x
    x = 335,591.26/498.58
  6. Step 6: Final answer
    x = 673.09

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.