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Finding the Fourth Proportional to 1,834.35, 2,749.91 and 678.75

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Solution

The fourth proportional to 1,834.35, 2,749.91 and 678.75 is: 1,017.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,834.35 : 2,749.91 = 678.75 : x
  2. Step 2: Convert to fraction form
    1,834.35/2,749.91 = 678.75/x
  3. Step 3: Cross multiply
    1,834.35x = 2,749.91 × 678.75
  4. Step 4: Simplify right side
    1,834.35x = 1,866,498.02
  5. Step 5: Solve for x
    x = 1,866,498.02/1,834.35
  6. Step 6: Final answer
    x = 1,017.53

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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.