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Finding the Fourth Proportional to 74.47, 111.75 and 48.80

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Solution

The fourth proportional to 74.47, 111.75 and 48.80 is: 73.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.47 : 111.75 = 48.80 : x
  2. Step 2: Convert to fraction form
    74.47/111.75 = 48.80/x
  3. Step 3: Cross multiply
    74.47x = 111.75 × 48.80
  4. Step 4: Simplify right side
    74.47x = 5,453.91
  5. Step 5: Solve for x
    x = 5,453.91/74.47
  6. Step 6: Final answer
    x = 73.24

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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.