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Finding the Fourth Proportional to 73.42, 110.70 and 72.05

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Solution

The fourth proportional to 73.42, 110.70 and 72.05 is: 108.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.42 : 110.70 = 72.05 : x
  2. Step 2: Convert to fraction form
    73.42/110.70 = 72.05/x
  3. Step 3: Cross multiply
    73.42x = 110.70 × 72.05
  4. Step 4: Simplify right side
    73.42x = 7,975.56
  5. Step 5: Solve for x
    x = 7,975.56/73.42
  6. Step 6: Final answer
    x = 108.64

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.