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Finding the Fourth Proportional to 1,392,676.07, 1,921,796.70 and 772,422.71

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Solution

The fourth proportional to 1,392,676.07, 1,921,796.70 and 772,422.71 is: 1,065,889.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392,676.07 : 1,921,796.70 = 772,422.71 : x
  2. Step 2: Convert to fraction form
    1,392,676.07/1,921,796.70 = 772,422.71/x
  3. Step 3: Cross multiply
    1,392,676.07x = 1,921,796.70 × 772,422.71
  4. Step 4: Simplify right side
    1,392,676.07x = 1,484,439,405,474.07
  5. Step 5: Solve for x
    x = 1,484,439,405,474.07/1,392,676.07
  6. Step 6: Final answer
    x = 1,065,889.94

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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.