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Finding the Fourth Proportional to 2,085.73, 3,128.60 and 852.93

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Solution

The fourth proportional to 2,085.73, 3,128.60 and 852.93 is: 1,279.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.73 : 3,128.60 = 852.93 : x
  2. Step 2: Convert to fraction form
    2,085.73/3,128.60 = 852.93/x
  3. Step 3: Cross multiply
    2,085.73x = 3,128.60 × 852.93
  4. Step 4: Simplify right side
    2,085.73x = 2,668,476.80
  5. Step 5: Solve for x
    x = 2,668,476.80/2,085.73
  6. Step 6: Final answer
    x = 1,279.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.