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Finding the Fourth Proportional to 208.29, 287.51 and 142.83

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Solution

The fourth proportional to 208.29, 287.51 and 142.83 is: 197.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.29 : 287.51 = 142.83 : x
  2. Step 2: Convert to fraction form
    208.29/287.51 = 142.83/x
  3. Step 3: Cross multiply
    208.29x = 287.51 × 142.83
  4. Step 4: Simplify right side
    208.29x = 41,064.34
  5. Step 5: Solve for x
    x = 41,064.34/208.29
  6. Step 6: Final answer
    x = 197.15

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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.