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Finding the Fourth Proportional to 315.45, 435.12 and 222.19

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Solution

The fourth proportional to 315.45, 435.12 and 222.19 is: 306.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.45 : 435.12 = 222.19 : x
  2. Step 2: Convert to fraction form
    315.45/435.12 = 222.19/x
  3. Step 3: Cross multiply
    315.45x = 435.12 × 222.19
  4. Step 4: Simplify right side
    315.45x = 96,679.31
  5. Step 5: Solve for x
    x = 96,679.31/315.45
  6. Step 6: Final answer
    x = 306.48

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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.