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Finding the Fourth Proportional to 74.52, 111.06 and 71.88

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Solution

The fourth proportional to 74.52, 111.06 and 71.88 is: 107.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.52 : 111.06 = 71.88 : x
  2. Step 2: Convert to fraction form
    74.52/111.06 = 71.88/x
  3. Step 3: Cross multiply
    74.52x = 111.06 × 71.88
  4. Step 4: Simplify right side
    74.52x = 7,982.99
  5. Step 5: Solve for x
    x = 7,982.99/74.52
  6. Step 6: Final answer
    x = 107.13

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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.