Home / 1,981.40-2,731.84-1,271.99

Finding the Fourth Proportional to 1,981.40, 2,731.84 and 1,271.99

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Solution

The fourth proportional to 1,981.40, 2,731.84 and 1,271.99 is: 1,753.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.40 : 2,731.84 = 1,271.99 : x
  2. Step 2: Convert to fraction form
    1,981.40/2,731.84 = 1,271.99/x
  3. Step 3: Cross multiply
    1,981.40x = 2,731.84 × 1,271.99
  4. Step 4: Simplify right side
    1,981.40x = 3,474,873.16
  5. Step 5: Solve for x
    x = 3,474,873.16/1,981.40
  6. Step 6: Final answer
    x = 1,753.75

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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.