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Finding the Fourth Proportional to 107.94, 149 and 64.28

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Solution

The fourth proportional to 107.94, 149 and 64.28 is: 88.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.94 : 149 = 64.28 : x
  2. Step 2: Convert to fraction form
    107.94/149 = 64.28/x
  3. Step 3: Cross multiply
    107.94x = 149 × 64.28
  4. Step 4: Simplify right side
    107.94x = 9,577.72
  5. Step 5: Solve for x
    x = 9,577.72/107.94
  6. Step 6: Final answer
    x = 88.73

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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.