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Finding the Fourth Proportional to 84.33, 126.99 and 74.32

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Solution

The fourth proportional to 84.33, 126.99 and 74.32 is: 111.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.33 : 126.99 = 74.32 : x
  2. Step 2: Convert to fraction form
    84.33/126.99 = 74.32/x
  3. Step 3: Cross multiply
    84.33x = 126.99 × 74.32
  4. Step 4: Simplify right side
    84.33x = 9,437.58
  5. Step 5: Solve for x
    x = 9,437.58/84.33
  6. Step 6: Final answer
    x = 111.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.