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Finding the Fourth Proportional to 3,899.16, 5,379.12 and 2,639.78

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Solution

The fourth proportional to 3,899.16, 5,379.12 and 2,639.78 is: 3,641.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.16 : 5,379.12 = 2,639.78 : x
  2. Step 2: Convert to fraction form
    3,899.16/5,379.12 = 2,639.78/x
  3. Step 3: Cross multiply
    3,899.16x = 5,379.12 × 2,639.78
  4. Step 4: Simplify right side
    3,899.16x = 14,199,666.50
  5. Step 5: Solve for x
    x = 14,199,666.50/3,899.16
  6. Step 6: Final answer
    x = 3,641.72

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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.