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Finding the Fourth Proportional to 74.30, 111.12 and 50.20

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Solution

The fourth proportional to 74.30, 111.12 and 50.20 is: 75.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.30 : 111.12 = 50.20 : x
  2. Step 2: Convert to fraction form
    74.30/111.12 = 50.20/x
  3. Step 3: Cross multiply
    74.30x = 111.12 × 50.20
  4. Step 4: Simplify right side
    74.30x = 5,578.22
  5. Step 5: Solve for x
    x = 5,578.22/74.30
  6. Step 6: Final answer
    x = 75.08

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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.