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Finding the Fourth Proportional to 107.20, 147.81 and 70.39

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Solution

The fourth proportional to 107.20, 147.81 and 70.39 is: 97.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.20 : 147.81 = 70.39 : x
  2. Step 2: Convert to fraction form
    107.20/147.81 = 70.39/x
  3. Step 3: Cross multiply
    107.20x = 147.81 × 70.39
  4. Step 4: Simplify right side
    107.20x = 10,404.35
  5. Step 5: Solve for x
    x = 10,404.35/107.20
  6. Step 6: Final answer
    x = 97.06

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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.