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Finding the Fourth Proportional to 208.70, 287.80 and 142.32

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Solution

The fourth proportional to 208.70, 287.80 and 142.32 is: 196.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.70 : 287.80 = 142.32 : x
  2. Step 2: Convert to fraction form
    208.70/287.80 = 142.32/x
  3. Step 3: Cross multiply
    208.70x = 287.80 × 142.32
  4. Step 4: Simplify right side
    208.70x = 40,959.70
  5. Step 5: Solve for x
    x = 40,959.70/208.70
  6. Step 6: Final answer
    x = 196.26

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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.