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Finding the Fourth Proportional to 70.58, 96.78 and 68.28

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Solution

The fourth proportional to 70.58, 96.78 and 68.28 is: 93.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.58 : 96.78 = 68.28 : x
  2. Step 2: Convert to fraction form
    70.58/96.78 = 68.28/x
  3. Step 3: Cross multiply
    70.58x = 96.78 × 68.28
  4. Step 4: Simplify right side
    70.58x = 6,608.14
  5. Step 5: Solve for x
    x = 6,608.14/70.58
  6. Step 6: Final answer
    x = 93.63

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.