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Finding the Fourth Proportional to 208.96, 288.47 and 139.11

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Solution

The fourth proportional to 208.96, 288.47 and 139.11 is: 192.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.96 : 288.47 = 139.11 : x
  2. Step 2: Convert to fraction form
    208.96/288.47 = 139.11/x
  3. Step 3: Cross multiply
    208.96x = 288.47 × 139.11
  4. Step 4: Simplify right side
    208.96x = 40,129.41
  5. Step 5: Solve for x
    x = 40,129.41/208.96
  6. Step 6: Final answer
    x = 192.05

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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.