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Finding the Fourth Proportional to 2,697.72, 4,047.20 and 1,398.90

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Solution

The fourth proportional to 2,697.72, 4,047.20 and 1,398.90 is: 2,098.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,697.72 : 4,047.20 = 1,398.90 : x
  2. Step 2: Convert to fraction form
    2,697.72/4,047.20 = 1,398.90/x
  3. Step 3: Cross multiply
    2,697.72x = 4,047.20 × 1,398.90
  4. Step 4: Simplify right side
    2,697.72x = 5,661,628.08
  5. Step 5: Solve for x
    x = 5,661,628.08/2,697.72
  6. Step 6: Final answer
    x = 2,098.67

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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.