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Finding the Fourth Proportional to 208.23, 287.38 and 115.00

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Solution

The fourth proportional to 208.23, 287.38 and 115.00 is: 158.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.23 : 287.38 = 115.00 : x
  2. Step 2: Convert to fraction form
    208.23/287.38 = 115.00/x
  3. Step 3: Cross multiply
    208.23x = 287.38 × 115.00
  4. Step 4: Simplify right side
    208.23x = 33,047.26
  5. Step 5: Solve for x
    x = 33,047.26/208.23
  6. Step 6: Final answer
    x = 158.71

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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.