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Finding the Fourth Proportional to 207.65, 312.08 and 135.96

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Solution

The fourth proportional to 207.65, 312.08 and 135.96 is: 204.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.65 : 312.08 = 135.96 : x
  2. Step 2: Convert to fraction form
    207.65/312.08 = 135.96/x
  3. Step 3: Cross multiply
    207.65x = 312.08 × 135.96
  4. Step 4: Simplify right side
    207.65x = 42,429.72
  5. Step 5: Solve for x
    x = 42,429.72/207.65
  6. Step 6: Final answer
    x = 204.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.