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Finding the Fourth Proportional to 207.81, 312.08 and 127.13

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Solution

The fourth proportional to 207.81, 312.08 and 127.13 is: 190.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.81 : 312.08 = 127.13 : x
  2. Step 2: Convert to fraction form
    207.81/312.08 = 127.13/x
  3. Step 3: Cross multiply
    207.81x = 312.08 × 127.13
  4. Step 4: Simplify right side
    207.81x = 39,672.53
  5. Step 5: Solve for x
    x = 39,672.53/207.81
  6. Step 6: Final answer
    x = 190.91

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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.