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Finding the Fourth Proportional to 70.94, 106.36 and 25.28

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Solution

The fourth proportional to 70.94, 106.36 and 25.28 is: 37.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.94 : 106.36 = 25.28 : x
  2. Step 2: Convert to fraction form
    70.94/106.36 = 25.28/x
  3. Step 3: Cross multiply
    70.94x = 106.36 × 25.28
  4. Step 4: Simplify right side
    70.94x = 2,688.78
  5. Step 5: Solve for x
    x = 2,688.78/70.94
  6. Step 6: Final answer
    x = 37.90

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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.