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Finding the Fourth Proportional to 100.72, 151.16 and 92.22

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Solution

The fourth proportional to 100.72, 151.16 and 92.22 is: 138.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.72 : 151.16 = 92.22 : x
  2. Step 2: Convert to fraction form
    100.72/151.16 = 92.22/x
  3. Step 3: Cross multiply
    100.72x = 151.16 × 92.22
  4. Step 4: Simplify right side
    100.72x = 13,939.98
  5. Step 5: Solve for x
    x = 13,939.98/100.72
  6. Step 6: Final answer
    x = 138.40

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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.