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Finding the Fourth Proportional to 107.50, 148.36 and 68.70

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Solution

The fourth proportional to 107.50, 148.36 and 68.70 is: 94.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.50 : 148.36 = 68.70 : x
  2. Step 2: Convert to fraction form
    107.50/148.36 = 68.70/x
  3. Step 3: Cross multiply
    107.50x = 148.36 × 68.70
  4. Step 4: Simplify right side
    107.50x = 10,192.33
  5. Step 5: Solve for x
    x = 10,192.33/107.50
  6. Step 6: Final answer
    x = 94.81

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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.