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Finding the Fourth Proportional to 131.79, 181.89 and 72.79

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Solution

The fourth proportional to 131.79, 181.89 and 72.79 is: 100.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.79 : 181.89 = 72.79 : x
  2. Step 2: Convert to fraction form
    131.79/181.89 = 72.79/x
  3. Step 3: Cross multiply
    131.79x = 181.89 × 72.79
  4. Step 4: Simplify right side
    131.79x = 13,240.39
  5. Step 5: Solve for x
    x = 13,240.39/131.79
  6. Step 6: Final answer
    x = 100.46

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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.