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Finding the Fourth Proportional to 208.51, 287.82 and 143.05

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Solution

The fourth proportional to 208.51, 287.82 and 143.05 is: 197.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.51 : 287.82 = 143.05 : x
  2. Step 2: Convert to fraction form
    208.51/287.82 = 143.05/x
  3. Step 3: Cross multiply
    208.51x = 287.82 × 143.05
  4. Step 4: Simplify right side
    208.51x = 41,172.65
  5. Step 5: Solve for x
    x = 41,172.65/208.51
  6. Step 6: Final answer
    x = 197.46

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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.