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Finding the Fourth Proportional to 667,947.28, 921,804.96 and 396,176.08

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Solution

The fourth proportional to 667,947.28, 921,804.96 and 396,176.08 is: 546,745.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,947.28 : 921,804.96 = 396,176.08 : x
  2. Step 2: Convert to fraction form
    667,947.28/921,804.96 = 396,176.08/x
  3. Step 3: Cross multiply
    667,947.28x = 921,804.96 × 396,176.08
  4. Step 4: Simplify right side
    667,947.28x = 365,197,075,577.36
  5. Step 5: Solve for x
    x = 365,197,075,577.36/667,947.28
  6. Step 6: Final answer
    x = 546,745.36

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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.