Home / 5,107.78-7,661.70-1,821.40

Finding the Fourth Proportional to 5,107.78, 7,661.70 and 1,821.40

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Solution

The fourth proportional to 5,107.78, 7,661.70 and 1,821.40 is: 2,732.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,107.78 : 7,661.70 = 1,821.40 : x
  2. Step 2: Convert to fraction form
    5,107.78/7,661.70 = 1,821.40/x
  3. Step 3: Cross multiply
    5,107.78x = 7,661.70 × 1,821.40
  4. Step 4: Simplify right side
    5,107.78x = 13,955,020.38
  5. Step 5: Solve for x
    x = 13,955,020.38/5,107.78
  6. Step 6: Final answer
    x = 2,732.11

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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.