Home / 1,868.80-2,576.28-1,278.40

Finding the Fourth Proportional to 1,868.80, 2,576.28 and 1,278.40

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Solution

The fourth proportional to 1,868.80, 2,576.28 and 1,278.40 is: 1,762.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,868.80 : 2,576.28 = 1,278.40 : x
  2. Step 2: Convert to fraction form
    1,868.80/2,576.28 = 1,278.40/x
  3. Step 3: Cross multiply
    1,868.80x = 2,576.28 × 1,278.40
  4. Step 4: Simplify right side
    1,868.80x = 3,293,516.35
  5. Step 5: Solve for x
    x = 3,293,516.35/1,868.80
  6. Step 6: Final answer
    x = 1,762.37

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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.