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Finding the Fourth Proportional to 68.63, 102.81 and 53.36

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Solution

The fourth proportional to 68.63, 102.81 and 53.36 is: 79.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.63 : 102.81 = 53.36 : x
  2. Step 2: Convert to fraction form
    68.63/102.81 = 53.36/x
  3. Step 3: Cross multiply
    68.63x = 102.81 × 53.36
  4. Step 4: Simplify right side
    68.63x = 5,485.94
  5. Step 5: Solve for x
    x = 5,485.94/68.63
  6. Step 6: Final answer
    x = 79.94

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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.