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Finding the Fourth Proportional to 1,994.63, 2,978.78 and 1,888.11

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Solution

The fourth proportional to 1,994.63, 2,978.78 and 1,888.11 is: 2,819.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,994.63 : 2,978.78 = 1,888.11 : x
  2. Step 2: Convert to fraction form
    1,994.63/2,978.78 = 1,888.11/x
  3. Step 3: Cross multiply
    1,994.63x = 2,978.78 × 1,888.11
  4. Step 4: Simplify right side
    1,994.63x = 5,624,254.87
  5. Step 5: Solve for x
    x = 5,624,254.87/1,994.63
  6. Step 6: Final answer
    x = 2,819.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.