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Finding the Fourth Proportional to 71.26, 107.47 and 70.48

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Solution

The fourth proportional to 71.26, 107.47 and 70.48 is: 106.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.26 : 107.47 = 70.48 : x
  2. Step 2: Convert to fraction form
    71.26/107.47 = 70.48/x
  3. Step 3: Cross multiply
    71.26x = 107.47 × 70.48
  4. Step 4: Simplify right side
    71.26x = 7,574.49
  5. Step 5: Solve for x
    x = 7,574.49/71.26
  6. Step 6: Final answer
    x = 106.29

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.