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Finding the Fourth Proportional to 589.38, 813.18 and 490.98

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Solution

The fourth proportional to 589.38, 813.18 and 490.98 is: 677.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    589.38 : 813.18 = 490.98 : x
  2. Step 2: Convert to fraction form
    589.38/813.18 = 490.98/x
  3. Step 3: Cross multiply
    589.38x = 813.18 × 490.98
  4. Step 4: Simplify right side
    589.38x = 399,255.12
  5. Step 5: Solve for x
    x = 399,255.12/589.38
  6. Step 6: Final answer
    x = 677.42

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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.