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Finding the Fourth Proportional to 208.93, 288.42 and 139.09

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Solution

The fourth proportional to 208.93, 288.42 and 139.09 is: 192.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.93 : 288.42 = 139.09 : x
  2. Step 2: Convert to fraction form
    208.93/288.42 = 139.09/x
  3. Step 3: Cross multiply
    208.93x = 288.42 × 139.09
  4. Step 4: Simplify right side
    208.93x = 40,116.34
  5. Step 5: Solve for x
    x = 40,116.34/208.93
  6. Step 6: Final answer
    x = 192.01

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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.