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Finding the Fourth Proportional to 131.82, 181.81 and 79.30

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Solution

The fourth proportional to 131.82, 181.81 and 79.30 is: 109.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.82 : 181.81 = 79.30 : x
  2. Step 2: Convert to fraction form
    131.82/181.81 = 79.30/x
  3. Step 3: Cross multiply
    131.82x = 181.81 × 79.30
  4. Step 4: Simplify right side
    131.82x = 14,417.14
  5. Step 5: Solve for x
    x = 14,417.14/131.82
  6. Step 6: Final answer
    x = 109.37

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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.