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Finding the Fourth Proportional to 70.82, 106.14 and 40.40

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Solution

The fourth proportional to 70.82, 106.14 and 40.40 is: 60.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.82 : 106.14 = 40.40 : x
  2. Step 2: Convert to fraction form
    70.82/106.14 = 40.40/x
  3. Step 3: Cross multiply
    70.82x = 106.14 × 40.40
  4. Step 4: Simplify right side
    70.82x = 4,288.06
  5. Step 5: Solve for x
    x = 4,288.06/70.82
  6. Step 6: Final answer
    x = 60.55

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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.