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Finding the Fourth Proportional to 719,289.11, 992,548.31 and 396,978.40

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Solution

The fourth proportional to 719,289.11, 992,548.31 and 396,978.40 is: 547,791.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    719,289.11 : 992,548.31 = 396,978.40 : x
  2. Step 2: Convert to fraction form
    719,289.11/992,548.31 = 396,978.40/x
  3. Step 3: Cross multiply
    719,289.11x = 992,548.31 × 396,978.40
  4. Step 4: Simplify right side
    719,289.11x = 394,020,239,282.30
  5. Step 5: Solve for x
    x = 394,020,239,282.30/719,289.11
  6. Step 6: Final answer
    x = 547,791.19

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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.