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Finding the Fourth Proportional to 74.63, 111.20 and 71.19

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Solution

The fourth proportional to 74.63, 111.20 and 71.19 is: 106.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.63 : 111.20 = 71.19 : x
  2. Step 2: Convert to fraction form
    74.63/111.20 = 71.19/x
  3. Step 3: Cross multiply
    74.63x = 111.20 × 71.19
  4. Step 4: Simplify right side
    74.63x = 7,915.97
  5. Step 5: Solve for x
    x = 7,915.97/74.63
  6. Step 6: Final answer
    x = 106.07

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.