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Finding the Fourth Proportional to 318.79, 439.93 and 225.70

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Solution

The fourth proportional to 318.79, 439.93 and 225.70 is: 311.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.79 : 439.93 = 225.70 : x
  2. Step 2: Convert to fraction form
    318.79/439.93 = 225.70/x
  3. Step 3: Cross multiply
    318.79x = 439.93 × 225.70
  4. Step 4: Simplify right side
    318.79x = 99,291.38
  5. Step 5: Solve for x
    x = 99,291.38/318.79
  6. Step 6: Final answer
    x = 311.46

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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.