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Finding the Fourth Proportional to 1,880.40, 2,820.60 and 785.55

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Solution

The fourth proportional to 1,880.40, 2,820.60 and 785.55 is: 1,178.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,880.40 : 2,820.60 = 785.55 : x
  2. Step 2: Convert to fraction form
    1,880.40/2,820.60 = 785.55/x
  3. Step 3: Cross multiply
    1,880.40x = 2,820.60 × 785.55
  4. Step 4: Simplify right side
    1,880.40x = 2,215,722.33
  5. Step 5: Solve for x
    x = 2,215,722.33/1,880.40
  6. Step 6: Final answer
    x = 1,178.33

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1.5x scale

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.