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Finding the Fourth Proportional to 1,793.92, 2,688.64 and 638.40

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Solution

The fourth proportional to 1,793.92, 2,688.64 and 638.40 is: 956.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,793.92 : 2,688.64 = 638.40 : x
  2. Step 2: Convert to fraction form
    1,793.92/2,688.64 = 638.40/x
  3. Step 3: Cross multiply
    1,793.92x = 2,688.64 × 638.40
  4. Step 4: Simplify right side
    1,793.92x = 1,716,427.78
  5. Step 5: Solve for x
    x = 1,716,427.78/1,793.92
  6. Step 6: Final answer
    x = 956.80

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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.