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Finding the Fourth Proportional to 131.77, 181.83 and 79.31

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Solution

The fourth proportional to 131.77, 181.83 and 79.31 is: 109.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.77 : 181.83 = 79.31 : x
  2. Step 2: Convert to fraction form
    131.77/181.83 = 79.31/x
  3. Step 3: Cross multiply
    131.77x = 181.83 × 79.31
  4. Step 4: Simplify right side
    131.77x = 14,419.63
  5. Step 5: Solve for x
    x = 14,419.63/131.77
  6. Step 6: Final answer
    x = 109.43

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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.