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Finding the Fourth Proportional to 6,428.16, 8,871.72 and 3,775.92

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Solution

The fourth proportional to 6,428.16, 8,871.72 and 3,775.92 is: 5,211.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,428.16 : 8,871.72 = 3,775.92 : x
  2. Step 2: Convert to fraction form
    6,428.16/8,871.72 = 3,775.92/x
  3. Step 3: Cross multiply
    6,428.16x = 8,871.72 × 3,775.92
  4. Step 4: Simplify right side
    6,428.16x = 33,498,904.98
  5. Step 5: Solve for x
    x = 33,498,904.98/6,428.16
  6. Step 6: Final answer
    x = 5,211.27

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1.5x scale

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.