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Finding the Fourth Proportional to 6,428.39, 8,871.39 and 3,775.75

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Solution

The fourth proportional to 6,428.39, 8,871.39 and 3,775.75 is: 5,210.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,428.39 : 8,871.39 = 3,775.75 : x
  2. Step 2: Convert to fraction form
    6,428.39/8,871.39 = 3,775.75/x
  3. Step 3: Cross multiply
    6,428.39x = 8,871.39 × 3,775.75
  4. Step 4: Simplify right side
    6,428.39x = 33,496,128.61
  5. Step 5: Solve for x
    x = 33,496,128.61/6,428.39
  6. Step 6: Final answer
    x = 5,210.66

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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.