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Finding the Fourth Proportional to 2,790.58, 4,186.65 and 842.80

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Solution

The fourth proportional to 2,790.58, 4,186.65 and 842.80 is: 1,264.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,790.58 : 4,186.65 = 842.80 : x
  2. Step 2: Convert to fraction form
    2,790.58/4,186.65 = 842.80/x
  3. Step 3: Cross multiply
    2,790.58x = 4,186.65 × 842.80
  4. Step 4: Simplify right side
    2,790.58x = 3,528,508.62
  5. Step 5: Solve for x
    x = 3,528,508.62/2,790.58
  6. Step 6: Final answer
    x = 1,264.44

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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.