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Finding the Fourth Proportional to 3,930.41, 5,420.94 and 2,868.01

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Solution

The fourth proportional to 3,930.41, 5,420.94 and 2,868.01 is: 3,955.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,930.41 : 5,420.94 = 2,868.01 : x
  2. Step 2: Convert to fraction form
    3,930.41/5,420.94 = 2,868.01/x
  3. Step 3: Cross multiply
    3,930.41x = 5,420.94 × 2,868.01
  4. Step 4: Simplify right side
    3,930.41x = 15,547,310.13
  5. Step 5: Solve for x
    x = 15,547,310.13/3,930.41
  6. Step 6: Final answer
    x = 3,955.65

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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.