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Finding the Fourth Proportional to 84.10, 125.53 and 74.38

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Solution

The fourth proportional to 84.10, 125.53 and 74.38 is: 111.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.10 : 125.53 = 74.38 : x
  2. Step 2: Convert to fraction form
    84.10/125.53 = 74.38/x
  3. Step 3: Cross multiply
    84.10x = 125.53 × 74.38
  4. Step 4: Simplify right side
    84.10x = 9,336.92
  5. Step 5: Solve for x
    x = 9,336.92/84.10
  6. Step 6: Final answer
    x = 111.02

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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.