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Finding the Fourth Proportional to 99.93, 149.78 and 54.19

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Solution

The fourth proportional to 99.93, 149.78 and 54.19 is: 81.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.93 : 149.78 = 54.19 : x
  2. Step 2: Convert to fraction form
    99.93/149.78 = 54.19/x
  3. Step 3: Cross multiply
    99.93x = 149.78 × 54.19
  4. Step 4: Simplify right side
    99.93x = 8,116.31
  5. Step 5: Solve for x
    x = 8,116.31/99.93
  6. Step 6: Final answer
    x = 81.22

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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.