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Finding the Fourth Proportional to 73.68, 111.21 and 72.36

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Solution

The fourth proportional to 73.68, 111.21 and 72.36 is: 109.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.68 : 111.21 = 72.36 : x
  2. Step 2: Convert to fraction form
    73.68/111.21 = 72.36/x
  3. Step 3: Cross multiply
    73.68x = 111.21 × 72.36
  4. Step 4: Simplify right side
    73.68x = 8,047.16
  5. Step 5: Solve for x
    x = 8,047.16/73.68
  6. Step 6: Final answer
    x = 109.22

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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.