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Finding the Fourth Proportional to 207.93, 287.00 and 138.05

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Solution

The fourth proportional to 207.93, 287.00 and 138.05 is: 190.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.93 : 287.00 = 138.05 : x
  2. Step 2: Convert to fraction form
    207.93/287.00 = 138.05/x
  3. Step 3: Cross multiply
    207.93x = 287.00 × 138.05
  4. Step 4: Simplify right side
    207.93x = 39,619.26
  5. Step 5: Solve for x
    x = 39,619.26/207.93
  6. Step 6: Final answer
    x = 190.54

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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.