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Finding the Fourth Proportional to 68.56, 93.78 and 68.28

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Solution

The fourth proportional to 68.56, 93.78 and 68.28 is: 93.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.56 : 93.78 = 68.28 : x
  2. Step 2: Convert to fraction form
    68.56/93.78 = 68.28/x
  3. Step 3: Cross multiply
    68.56x = 93.78 × 68.28
  4. Step 4: Simplify right side
    68.56x = 6,403.30
  5. Step 5: Solve for x
    x = 6,403.30/68.56
  6. Step 6: Final answer
    x = 93.40

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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.