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Finding the Fourth Proportional to 70.81, 106.25 and 25.16

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Solution

The fourth proportional to 70.81, 106.25 and 25.16 is: 37.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.81 : 106.25 = 25.16 : x
  2. Step 2: Convert to fraction form
    70.81/106.25 = 25.16/x
  3. Step 3: Cross multiply
    70.81x = 106.25 × 25.16
  4. Step 4: Simplify right side
    70.81x = 2,673.25
  5. Step 5: Solve for x
    x = 2,673.25/70.81
  6. Step 6: Final answer
    x = 37.75

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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.