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Finding the Fourth Proportional to 131.75, 197.75 and 99.89

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Solution

The fourth proportional to 131.75, 197.75 and 99.89 is: 149.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.75 : 197.75 = 99.89 : x
  2. Step 2: Convert to fraction form
    131.75/197.75 = 99.89/x
  3. Step 3: Cross multiply
    131.75x = 197.75 × 99.89
  4. Step 4: Simplify right side
    131.75x = 19,752.51
  5. Step 5: Solve for x
    x = 19,752.51/131.75
  6. Step 6: Final answer
    x = 149.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.