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Finding the Fourth Proportional to 104.57, 144.13 and 83.78

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Solution

The fourth proportional to 104.57, 144.13 and 83.78 is: 115.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.57 : 144.13 = 83.78 : x
  2. Step 2: Convert to fraction form
    104.57/144.13 = 83.78/x
  3. Step 3: Cross multiply
    104.57x = 144.13 × 83.78
  4. Step 4: Simplify right side
    104.57x = 12,075.21
  5. Step 5: Solve for x
    x = 12,075.21/104.57
  6. Step 6: Final answer
    x = 115.47

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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.