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Finding the Fourth Proportional to 92.69, 128.10 and 68.30

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Solution

The fourth proportional to 92.69, 128.10 and 68.30 is: 94.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.69 : 128.10 = 68.30 : x
  2. Step 2: Convert to fraction form
    92.69/128.10 = 68.30/x
  3. Step 3: Cross multiply
    92.69x = 128.10 × 68.30
  4. Step 4: Simplify right side
    92.69x = 8,748.59
  5. Step 5: Solve for x
    x = 8,748.59/92.69
  6. Step 6: Final answer
    x = 94.39

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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.