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Finding the Fourth Proportional to 1,858.78, 2,785.50 and 1,118.70

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Solution

The fourth proportional to 1,858.78, 2,785.50 and 1,118.70 is: 1,676.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.78 : 2,785.50 = 1,118.70 : x
  2. Step 2: Convert to fraction form
    1,858.78/2,785.50 = 1,118.70/x
  3. Step 3: Cross multiply
    1,858.78x = 2,785.50 × 1,118.70
  4. Step 4: Simplify right side
    1,858.78x = 3,116,138.85
  5. Step 5: Solve for x
    x = 3,116,138.85/1,858.78
  6. Step 6: Final answer
    x = 1,676.45

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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.