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Finding the Fourth Proportional to 207.84, 286.86 and 137.88

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Solution

The fourth proportional to 207.84, 286.86 and 137.88 is: 190.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.84 : 286.86 = 137.88 : x
  2. Step 2: Convert to fraction form
    207.84/286.86 = 137.88/x
  3. Step 3: Cross multiply
    207.84x = 286.86 × 137.88
  4. Step 4: Simplify right side
    207.84x = 39,552.26
  5. Step 5: Solve for x
    x = 39,552.26/207.84
  6. Step 6: Final answer
    x = 190.30

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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.