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Finding the Fourth Proportional to 72.45, 107.99 and 66.98

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Solution

The fourth proportional to 72.45, 107.99 and 66.98 is: 99.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.45 : 107.99 = 66.98 : x
  2. Step 2: Convert to fraction form
    72.45/107.99 = 66.98/x
  3. Step 3: Cross multiply
    72.45x = 107.99 × 66.98
  4. Step 4: Simplify right side
    72.45x = 7,233.17
  5. Step 5: Solve for x
    x = 7,233.17/72.45
  6. Step 6: Final answer
    x = 99.84

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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.