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Finding the Fourth Proportional to 416.20, 574.26 and 317.80

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Solution

The fourth proportional to 416.20, 574.26 and 317.80 is: 438.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.20 : 574.26 = 317.80 : x
  2. Step 2: Convert to fraction form
    416.20/574.26 = 317.80/x
  3. Step 3: Cross multiply
    416.20x = 574.26 × 317.80
  4. Step 4: Simplify right side
    416.20x = 182,499.83
  5. Step 5: Solve for x
    x = 182,499.83/416.20
  6. Step 6: Final answer
    x = 438.49

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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.