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Finding the Fourth Proportional to 151.34, 208.91 and 107.81

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Solution

The fourth proportional to 151.34, 208.91 and 107.81 is: 148.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.34 : 208.91 = 107.81 : x
  2. Step 2: Convert to fraction form
    151.34/208.91 = 107.81/x
  3. Step 3: Cross multiply
    151.34x = 208.91 × 107.81
  4. Step 4: Simplify right side
    151.34x = 22,522.59
  5. Step 5: Solve for x
    x = 22,522.59/151.34
  6. Step 6: Final answer
    x = 148.82

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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.