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Finding the Fourth Proportional to 2,631.68, 3,947.20 and 683.84

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Solution

The fourth proportional to 2,631.68, 3,947.20 and 683.84 is: 1,025.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,631.68 : 3,947.20 = 683.84 : x
  2. Step 2: Convert to fraction form
    2,631.68/3,947.20 = 683.84/x
  3. Step 3: Cross multiply
    2,631.68x = 3,947.20 × 683.84
  4. Step 4: Simplify right side
    2,631.68x = 2,699,253.25
  5. Step 5: Solve for x
    x = 2,699,253.25/2,631.68
  6. Step 6: Final answer
    x = 1,025.68

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1.5x scale

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.