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Finding the Fourth Proportional to 1,986.84, 2,740.86 and 1,427.40

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Solution

The fourth proportional to 1,986.84, 2,740.86 and 1,427.40 is: 1,969.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.84 : 2,740.86 = 1,427.40 : x
  2. Step 2: Convert to fraction form
    1,986.84/2,740.86 = 1,427.40/x
  3. Step 3: Cross multiply
    1,986.84x = 2,740.86 × 1,427.40
  4. Step 4: Simplify right side
    1,986.84x = 3,912,303.56
  5. Step 5: Solve for x
    x = 3,912,303.56/1,986.84
  6. Step 6: Final answer
    x = 1,969.11

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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.