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Finding the Fourth Proportional to 72.12, 107.21 and 70.68

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Solution

The fourth proportional to 72.12, 107.21 and 70.68 is: 105.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.12 : 107.21 = 70.68 : x
  2. Step 2: Convert to fraction form
    72.12/107.21 = 70.68/x
  3. Step 3: Cross multiply
    72.12x = 107.21 × 70.68
  4. Step 4: Simplify right side
    72.12x = 7,577.25
  5. Step 5: Solve for x
    x = 7,577.25/72.12
  6. Step 6: Final answer
    x = 105.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.