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Finding the Fourth Proportional to 225.99, 340.66 and 212.78

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Solution

The fourth proportional to 225.99, 340.66 and 212.78 is: 320.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.99 : 340.66 = 212.78 : x
  2. Step 2: Convert to fraction form
    225.99/340.66 = 212.78/x
  3. Step 3: Cross multiply
    225.99x = 340.66 × 212.78
  4. Step 4: Simplify right side
    225.99x = 72,483.64
  5. Step 5: Solve for x
    x = 72,483.64/225.99
  6. Step 6: Final answer
    x = 320.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.