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Finding the Fourth Proportional to 6,439.40, 8,885.40 and 3,923.54

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Solution

The fourth proportional to 6,439.40, 8,885.40 and 3,923.54 is: 5,413.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,439.40 : 8,885.40 = 3,923.54 : x
  2. Step 2: Convert to fraction form
    6,439.40/8,885.40 = 3,923.54/x
  3. Step 3: Cross multiply
    6,439.40x = 8,885.40 × 3,923.54
  4. Step 4: Simplify right side
    6,439.40x = 34,862,222.32
  5. Step 5: Solve for x
    x = 34,862,222.32/6,439.40
  6. Step 6: Final answer
    x = 5,413.89

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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.