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Finding the Fourth Proportional to 2,639.16, 3,957 and 993.72

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Solution

The fourth proportional to 2,639.16, 3,957 and 993.72 is: 1,489.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.16 : 3,957 = 993.72 : x
  2. Step 2: Convert to fraction form
    2,639.16/3,957 = 993.72/x
  3. Step 3: Cross multiply
    2,639.16x = 3,957 × 993.72
  4. Step 4: Simplify right side
    2,639.16x = 3,932,150.04
  5. Step 5: Solve for x
    x = 3,932,150.04/2,639.16
  6. Step 6: Final answer
    x = 1,489.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.