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Finding the Fourth Proportional to 68.91, 102.54 and 68.64

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Solution

The fourth proportional to 68.91, 102.54 and 68.64 is: 102.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.91 : 102.54 = 68.64 : x
  2. Step 2: Convert to fraction form
    68.91/102.54 = 68.64/x
  3. Step 3: Cross multiply
    68.91x = 102.54 × 68.64
  4. Step 4: Simplify right side
    68.91x = 7,038.35
  5. Step 5: Solve for x
    x = 7,038.35/68.91
  6. Step 6: Final answer
    x = 102.14

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.