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Finding the Fourth Proportional to 6,873.80, 9,486.12 and 3,890

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Solution

The fourth proportional to 6,873.80, 9,486.12 and 3,890 is: 5,368.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,873.80 : 9,486.12 = 3,890 : x
  2. Step 2: Convert to fraction form
    6,873.80/9,486.12 = 3,890/x
  3. Step 3: Cross multiply
    6,873.80x = 9,486.12 × 3,890
  4. Step 4: Simplify right side
    6,873.80x = 36,901,006.80
  5. Step 5: Solve for x
    x = 36,901,006.80/6,873.80
  6. Step 6: Final answer
    x = 5,368.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.