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Finding the Fourth Proportional to 207.81, 310.91 and 135.72

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Solution

The fourth proportional to 207.81, 310.91 and 135.72 is: 203.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.81 : 310.91 = 135.72 : x
  2. Step 2: Convert to fraction form
    207.81/310.91 = 135.72/x
  3. Step 3: Cross multiply
    207.81x = 310.91 × 135.72
  4. Step 4: Simplify right side
    207.81x = 42,196.03
  5. Step 5: Solve for x
    x = 42,196.03/207.81
  6. Step 6: Final answer
    x = 203.05

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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.