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Finding the Fourth Proportional to 104.99, 144.78 and 68.16

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Solution

The fourth proportional to 104.99, 144.78 and 68.16 is: 94.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.99 : 144.78 = 68.16 : x
  2. Step 2: Convert to fraction form
    104.99/144.78 = 68.16/x
  3. Step 3: Cross multiply
    104.99x = 144.78 × 68.16
  4. Step 4: Simplify right side
    104.99x = 9,868.20
  5. Step 5: Solve for x
    x = 9,868.20/104.99
  6. Step 6: Final answer
    x = 94.00

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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.