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Finding the Fourth Proportional to 100.08, 137.88 and 84.51

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Solution

The fourth proportional to 100.08, 137.88 and 84.51 is: 116.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.08 : 137.88 = 84.51 : x
  2. Step 2: Convert to fraction form
    100.08/137.88 = 84.51/x
  3. Step 3: Cross multiply
    100.08x = 137.88 × 84.51
  4. Step 4: Simplify right side
    100.08x = 11,652.24
  5. Step 5: Solve for x
    x = 11,652.24/100.08
  6. Step 6: Final answer
    x = 116.43

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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.