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Finding the Fourth Proportional to 131.81, 197.73 and 70.91

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Solution

The fourth proportional to 131.81, 197.73 and 70.91 is: 106.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.81 : 197.73 = 70.91 : x
  2. Step 2: Convert to fraction form
    131.81/197.73 = 70.91/x
  3. Step 3: Cross multiply
    131.81x = 197.73 × 70.91
  4. Step 4: Simplify right side
    131.81x = 14,019.96
  5. Step 5: Solve for x
    x = 14,019.96/131.81
  6. Step 6: Final answer
    x = 106.37

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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.