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Finding the Fourth Proportional to 100.84, 151.96 and 84.10

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Solution

The fourth proportional to 100.84, 151.96 and 84.10 is: 126.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.84 : 151.96 = 84.10 : x
  2. Step 2: Convert to fraction form
    100.84/151.96 = 84.10/x
  3. Step 3: Cross multiply
    100.84x = 151.96 × 84.10
  4. Step 4: Simplify right side
    100.84x = 12,779.84
  5. Step 5: Solve for x
    x = 12,779.84/100.84
  6. Step 6: Final answer
    x = 126.73

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.