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Finding the Fourth Proportional to 100.09, 149.41 and 84.71

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Solution

The fourth proportional to 100.09, 149.41 and 84.71 is: 126.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.09 : 149.41 = 84.71 : x
  2. Step 2: Convert to fraction form
    100.09/149.41 = 84.71/x
  3. Step 3: Cross multiply
    100.09x = 149.41 × 84.71
  4. Step 4: Simplify right side
    100.09x = 12,656.01
  5. Step 5: Solve for x
    x = 12,656.01/100.09
  6. Step 6: Final answer
    x = 126.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.