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Finding the Fourth Proportional to 1,515.75, 2,091.85 and 852.70

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Solution

The fourth proportional to 1,515.75, 2,091.85 and 852.70 is: 1,176.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.75 : 2,091.85 = 852.70 : x
  2. Step 2: Convert to fraction form
    1,515.75/2,091.85 = 852.70/x
  3. Step 3: Cross multiply
    1,515.75x = 2,091.85 × 852.70
  4. Step 4: Simplify right side
    1,515.75x = 1,783,725.34
  5. Step 5: Solve for x
    x = 1,783,725.34/1,515.75
  6. Step 6: Final answer
    x = 1,176.79

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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.