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Finding the Fourth Proportional to 319.16, 439.68 and 225.80

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Solution

The fourth proportional to 319.16, 439.68 and 225.80 is: 311.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.16 : 439.68 = 225.80 : x
  2. Step 2: Convert to fraction form
    319.16/439.68 = 225.80/x
  3. Step 3: Cross multiply
    319.16x = 439.68 × 225.80
  4. Step 4: Simplify right side
    319.16x = 99,279.74
  5. Step 5: Solve for x
    x = 99,279.74/319.16
  6. Step 6: Final answer
    x = 311.07

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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.