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Finding the Fourth Proportional to 1,399.92, 2,099.12 and 425.76

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Solution

The fourth proportional to 1,399.92, 2,099.12 and 425.76 is: 638.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.92 : 2,099.12 = 425.76 : x
  2. Step 2: Convert to fraction form
    1,399.92/2,099.12 = 425.76/x
  3. Step 3: Cross multiply
    1,399.92x = 2,099.12 × 425.76
  4. Step 4: Simplify right side
    1,399.92x = 893,721.33
  5. Step 5: Solve for x
    x = 893,721.33/1,399.92
  6. Step 6: Final answer
    x = 638.41

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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.