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Finding the Fourth Proportional to 107.62, 161.37 and 78.70

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Solution

The fourth proportional to 107.62, 161.37 and 78.70 is: 118.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.62 : 161.37 = 78.70 : x
  2. Step 2: Convert to fraction form
    107.62/161.37 = 78.70/x
  3. Step 3: Cross multiply
    107.62x = 161.37 × 78.70
  4. Step 4: Simplify right side
    107.62x = 12,699.82
  5. Step 5: Solve for x
    x = 12,699.82/107.62
  6. Step 6: Final answer
    x = 118.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.