Home / 1,912.42-2,639.28-1,127.08

Finding the Fourth Proportional to 1,912.42, 2,639.28 and 1,127.08

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Solution

The fourth proportional to 1,912.42, 2,639.28 and 1,127.08 is: 1,555.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.42 : 2,639.28 = 1,127.08 : x
  2. Step 2: Convert to fraction form
    1,912.42/2,639.28 = 1,127.08/x
  3. Step 3: Cross multiply
    1,912.42x = 2,639.28 × 1,127.08
  4. Step 4: Simplify right side
    1,912.42x = 2,974,679.70
  5. Step 5: Solve for x
    x = 2,974,679.70/1,912.42
  6. Step 6: Final answer
    x = 1,555.45

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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.