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Finding the Fourth Proportional to 1,375,863.69, 1,898,628 and 764,055.21

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Solution

The fourth proportional to 1,375,863.69, 1,898,628 and 764,055.21 is: 1,054,360.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375,863.69 : 1,898,628 = 764,055.21 : x
  2. Step 2: Convert to fraction form
    1,375,863.69/1,898,628 = 764,055.21/x
  3. Step 3: Cross multiply
    1,375,863.69x = 1,898,628 × 764,055.21
  4. Step 4: Simplify right side
    1,375,863.69x = 1,450,656,615,251.88
  5. Step 5: Solve for x
    x = 1,450,656,615,251.88/1,375,863.69
  6. Step 6: Final answer
    x = 1,054,360.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.