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Finding the Fourth Proportional to 223.74, 308.70 and 212.40

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Solution

The fourth proportional to 223.74, 308.70 and 212.40 is: 293.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.74 : 308.70 = 212.40 : x
  2. Step 2: Convert to fraction form
    223.74/308.70 = 212.40/x
  3. Step 3: Cross multiply
    223.74x = 308.70 × 212.40
  4. Step 4: Simplify right side
    223.74x = 65,567.88
  5. Step 5: Solve for x
    x = 65,567.88/223.74
  6. Step 6: Final answer
    x = 293.05

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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.