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Finding the Fourth Proportional to 1,880.76, 2,821.41 and 785.34

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Solution

The fourth proportional to 1,880.76, 2,821.41 and 785.34 is: 1,178.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,880.76 : 2,821.41 = 785.34 : x
  2. Step 2: Convert to fraction form
    1,880.76/2,821.41 = 785.34/x
  3. Step 3: Cross multiply
    1,880.76x = 2,821.41 × 785.34
  4. Step 4: Simplify right side
    1,880.76x = 2,215,766.13
  5. Step 5: Solve for x
    x = 2,215,766.13/1,880.76
  6. Step 6: Final answer
    x = 1,178.12

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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.