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Finding the Fourth Proportional to 1,793.22, 2,688.20 and 638.70

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Solution

The fourth proportional to 1,793.22, 2,688.20 and 638.70 is: 957.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,793.22 : 2,688.20 = 638.70 : x
  2. Step 2: Convert to fraction form
    1,793.22/2,688.20 = 638.70/x
  3. Step 3: Cross multiply
    1,793.22x = 2,688.20 × 638.70
  4. Step 4: Simplify right side
    1,793.22x = 1,716,946.05
  5. Step 5: Solve for x
    x = 1,716,946.05/1,793.22
  6. Step 6: Final answer
    x = 957.47

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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.