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Finding the Fourth Proportional to 3,907.20, 5,428.20 and 3,871.20

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Solution

The fourth proportional to 3,907.20, 5,428.20 and 3,871.20 is: 5,378.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,907.20 : 5,428.20 = 3,871.20 : x
  2. Step 2: Convert to fraction form
    3,907.20/5,428.20 = 3,871.20/x
  3. Step 3: Cross multiply
    3,907.20x = 5,428.20 × 3,871.20
  4. Step 4: Simplify right side
    3,907.20x = 21,013,647.84
  5. Step 5: Solve for x
    x = 21,013,647.84/3,907.20
  6. Step 6: Final answer
    x = 5,378.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.