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Finding the Fourth Proportional to 70.40, 106.16 and 69.92

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Solution

The fourth proportional to 70.40, 106.16 and 69.92 is: 105.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.40 : 106.16 = 69.92 : x
  2. Step 2: Convert to fraction form
    70.40/106.16 = 69.92/x
  3. Step 3: Cross multiply
    70.40x = 106.16 × 69.92
  4. Step 4: Simplify right side
    70.40x = 7,422.71
  5. Step 5: Solve for x
    x = 7,422.71/70.40
  6. Step 6: Final answer
    x = 105.44

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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.