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Finding the Fourth Proportional to 1,786.78, 2,680.58 and 554.12

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Solution

The fourth proportional to 1,786.78, 2,680.58 and 554.12 is: 831.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.78 : 2,680.58 = 554.12 : x
  2. Step 2: Convert to fraction form
    1,786.78/2,680.58 = 554.12/x
  3. Step 3: Cross multiply
    1,786.78x = 2,680.58 × 554.12
  4. Step 4: Simplify right side
    1,786.78x = 1,485,360.22
  5. Step 5: Solve for x
    x = 1,485,360.22/1,786.78
  6. Step 6: Final answer
    x = 831.31

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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.