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Finding the Fourth Proportional to 84.07, 116.13 and 74.25

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Solution

The fourth proportional to 84.07, 116.13 and 74.25 is: 102.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.07 : 116.13 = 74.25 : x
  2. Step 2: Convert to fraction form
    84.07/116.13 = 74.25/x
  3. Step 3: Cross multiply
    84.07x = 116.13 × 74.25
  4. Step 4: Simplify right side
    84.07x = 8,622.65
  5. Step 5: Solve for x
    x = 8,622.65/84.07
  6. Step 6: Final answer
    x = 102.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.