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Finding the Fourth Proportional to 107.88, 148.70 and 89.44

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Solution

The fourth proportional to 107.88, 148.70 and 89.44 is: 123.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.88 : 148.70 = 89.44 : x
  2. Step 2: Convert to fraction form
    107.88/148.70 = 89.44/x
  3. Step 3: Cross multiply
    107.88x = 148.70 × 89.44
  4. Step 4: Simplify right side
    107.88x = 13,299.73
  5. Step 5: Solve for x
    x = 13,299.73/107.88
  6. Step 6: Final answer
    x = 123.28

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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.