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Finding the Fourth Proportional to 105.80, 146.06 and 64.36

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Solution

The fourth proportional to 105.80, 146.06 and 64.36 is: 88.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.80 : 146.06 = 64.36 : x
  2. Step 2: Convert to fraction form
    105.80/146.06 = 64.36/x
  3. Step 3: Cross multiply
    105.80x = 146.06 × 64.36
  4. Step 4: Simplify right side
    105.80x = 9,399.73
  5. Step 5: Solve for x
    x = 9,399.73/105.80
  6. Step 6: Final answer
    x = 88.85

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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.