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Finding the Fourth Proportional to 1,351.90, 1,865.91 and 855.19

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Solution

The fourth proportional to 1,351.90, 1,865.91 and 855.19 is: 1,180.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.90 : 1,865.91 = 855.19 : x
  2. Step 2: Convert to fraction form
    1,351.90/1,865.91 = 855.19/x
  3. Step 3: Cross multiply
    1,351.90x = 1,865.91 × 855.19
  4. Step 4: Simplify right side
    1,351.90x = 1,595,707.57
  5. Step 5: Solve for x
    x = 1,595,707.57/1,351.90
  6. Step 6: Final answer
    x = 1,180.34

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1.5x scale

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.