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Finding the Fourth Proportional to 12,751.66, 19,128.30 and 3,391.53

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Solution

The fourth proportional to 12,751.66, 19,128.30 and 3,391.53 is: 5,087.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,751.66 : 19,128.30 = 3,391.53 : x
  2. Step 2: Convert to fraction form
    12,751.66/19,128.30 = 3,391.53/x
  3. Step 3: Cross multiply
    12,751.66x = 19,128.30 × 3,391.53
  4. Step 4: Simplify right side
    12,751.66x = 64,874,203.30
  5. Step 5: Solve for x
    x = 64,874,203.30/12,751.66
  6. Step 6: Final answer
    x = 5,087.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.