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Finding the Fourth Proportional to 151.39, 208.93 and 85.89

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Solution

The fourth proportional to 151.39, 208.93 and 85.89 is: 118.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.39 : 208.93 = 85.89 : x
  2. Step 2: Convert to fraction form
    151.39/208.93 = 85.89/x
  3. Step 3: Cross multiply
    151.39x = 208.93 × 85.89
  4. Step 4: Simplify right side
    151.39x = 17,945.00
  5. Step 5: Solve for x
    x = 17,945.00/151.39
  6. Step 6: Final answer
    x = 118.54

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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.