Home / 3,128.14-4,315.47-1,868.79

Finding the Fourth Proportional to 3,128.14, 4,315.47 and 1,868.79

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Solution

The fourth proportional to 3,128.14, 4,315.47 and 1,868.79 is: 2,578.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.14 : 4,315.47 = 1,868.79 : x
  2. Step 2: Convert to fraction form
    3,128.14/4,315.47 = 1,868.79/x
  3. Step 3: Cross multiply
    3,128.14x = 4,315.47 × 1,868.79
  4. Step 4: Simplify right side
    3,128.14x = 8,064,707.18
  5. Step 5: Solve for x
    x = 8,064,707.18/3,128.14
  6. Step 6: Final answer
    x = 2,578.12

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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.