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Finding the Fourth Proportional to 2,099.56, 3,148.92 and 638.68

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Solution

The fourth proportional to 2,099.56, 3,148.92 and 638.68 is: 957.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,099.56 : 3,148.92 = 638.68 : x
  2. Step 2: Convert to fraction form
    2,099.56/3,148.92 = 638.68/x
  3. Step 3: Cross multiply
    2,099.56x = 3,148.92 × 638.68
  4. Step 4: Simplify right side
    2,099.56x = 2,011,152.23
  5. Step 5: Solve for x
    x = 2,011,152.23/2,099.56
  6. Step 6: Final answer
    x = 957.89

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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.