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Finding the Fourth Proportional to 104.40, 143.40 and 92.40

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Solution

The fourth proportional to 104.40, 143.40 and 92.40 is: 126.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.40 : 143.40 = 92.40 : x
  2. Step 2: Convert to fraction form
    104.40/143.40 = 92.40/x
  3. Step 3: Cross multiply
    104.40x = 143.40 × 92.40
  4. Step 4: Simplify right side
    104.40x = 13,250.16
  5. Step 5: Solve for x
    x = 13,250.16/104.40
  6. Step 6: Final answer
    x = 126.92

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.