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Finding the Fourth Proportional to 74.46, 111.62 and 28.80

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Solution

The fourth proportional to 74.46, 111.62 and 28.80 is: 43.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.46 : 111.62 = 28.80 : x
  2. Step 2: Convert to fraction form
    74.46/111.62 = 28.80/x
  3. Step 3: Cross multiply
    74.46x = 111.62 × 28.80
  4. Step 4: Simplify right side
    74.46x = 3,214.51
  5. Step 5: Solve for x
    x = 3,214.51/74.46
  6. Step 6: Final answer
    x = 43.17

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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.