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Finding the Fourth Proportional to 2,103.81, 3,155.72 and 642.96

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Solution

The fourth proportional to 2,103.81, 3,155.72 and 642.96 is: 964.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,103.81 : 3,155.72 = 642.96 : x
  2. Step 2: Convert to fraction form
    2,103.81/3,155.72 = 642.96/x
  3. Step 3: Cross multiply
    2,103.81x = 3,155.72 × 642.96
  4. Step 4: Simplify right side
    2,103.81x = 2,028,982.74
  5. Step 5: Solve for x
    x = 2,028,982.74/2,103.81
  6. Step 6: Final answer
    x = 964.43

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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.