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Finding the Fourth Proportional to 131.94, 181.78 and 104.40

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Solution

The fourth proportional to 131.94, 181.78 and 104.40 is: 143.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.94 : 181.78 = 104.40 : x
  2. Step 2: Convert to fraction form
    131.94/181.78 = 104.40/x
  3. Step 3: Cross multiply
    131.94x = 181.78 × 104.40
  4. Step 4: Simplify right side
    131.94x = 18,977.57
  5. Step 5: Solve for x
    x = 18,977.57/131.94
  6. Step 6: Final answer
    x = 143.83

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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.