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Finding the Fourth Proportional to 235.12, 351.04 and 209.20

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Solution

The fourth proportional to 235.12, 351.04 and 209.20 is: 312.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.12 : 351.04 = 209.20 : x
  2. Step 2: Convert to fraction form
    235.12/351.04 = 209.20/x
  3. Step 3: Cross multiply
    235.12x = 351.04 × 209.20
  4. Step 4: Simplify right side
    235.12x = 73,437.57
  5. Step 5: Solve for x
    x = 73,437.57/235.12
  6. Step 6: Final answer
    x = 312.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.