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Finding the Fourth Proportional to 72.05, 107.15 and 71.29

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Solution

The fourth proportional to 72.05, 107.15 and 71.29 is: 106.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.05 : 107.15 = 71.29 : x
  2. Step 2: Convert to fraction form
    72.05/107.15 = 71.29/x
  3. Step 3: Cross multiply
    72.05x = 107.15 × 71.29
  4. Step 4: Simplify right side
    72.05x = 7,639.08
  5. Step 5: Solve for x
    x = 7,639.08/72.05
  6. Step 6: Final answer
    x = 106.02

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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.