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Finding the Fourth Proportional to 70.20, 96.86 and 40.68

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Solution

The fourth proportional to 70.20, 96.86 and 40.68 is: 56.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.20 : 96.86 = 40.68 : x
  2. Step 2: Convert to fraction form
    70.20/96.86 = 40.68/x
  3. Step 3: Cross multiply
    70.20x = 96.86 × 40.68
  4. Step 4: Simplify right side
    70.20x = 3,940.37
  5. Step 5: Solve for x
    x = 3,940.37/70.20
  6. Step 6: Final answer
    x = 56.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.