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Finding the Fourth Proportional to 99.09, 136.74 and 55.43

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Solution

The fourth proportional to 99.09, 136.74 and 55.43 is: 76.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.09 : 136.74 = 55.43 : x
  2. Step 2: Convert to fraction form
    99.09/136.74 = 55.43/x
  3. Step 3: Cross multiply
    99.09x = 136.74 × 55.43
  4. Step 4: Simplify right side
    99.09x = 7,578.81
  5. Step 5: Solve for x
    x = 7,578.81/99.09
  6. Step 6: Final answer
    x = 76.49

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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.