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Finding the Fourth Proportional to 92.94, 128.30 and 72.29

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Solution

The fourth proportional to 92.94, 128.30 and 72.29 is: 99.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.94 : 128.30 = 72.29 : x
  2. Step 2: Convert to fraction form
    92.94/128.30 = 72.29/x
  3. Step 3: Cross multiply
    92.94x = 128.30 × 72.29
  4. Step 4: Simplify right side
    92.94x = 9,273.80
  5. Step 5: Solve for x
    x = 9,273.80/92.94
  6. Step 6: Final answer
    x = 99.78

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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.