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Finding the Fourth Proportional to 2,878, 3,970.70 and 1,698.84

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Solution

The fourth proportional to 2,878, 3,970.70 and 1,698.84 is: 2,343.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,878 : 3,970.70 = 1,698.84 : x
  2. Step 2: Convert to fraction form
    2,878/3,970.70 = 1,698.84/x
  3. Step 3: Cross multiply
    2,878x = 3,970.70 × 1,698.84
  4. Step 4: Simplify right side
    2,878x = 6,745,583.99
  5. Step 5: Solve for x
    x = 6,745,583.99/2,878
  6. Step 6: Final answer
    x = 2,343.84

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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.