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Finding the Fourth Proportional to 92.95, 128.04 and 73.21

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Solution

The fourth proportional to 92.95, 128.04 and 73.21 is: 100.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.95 : 128.04 = 73.21 : x
  2. Step 2: Convert to fraction form
    92.95/128.04 = 73.21/x
  3. Step 3: Cross multiply
    92.95x = 128.04 × 73.21
  4. Step 4: Simplify right side
    92.95x = 9,372.80
  5. Step 5: Solve for x
    x = 9,372.80/92.95
  6. Step 6: Final answer
    x = 100.84

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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.