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Finding the Fourth Proportional to 719,405.58, 992,779.89 and 397,115.90

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Solution

The fourth proportional to 719,405.58, 992,779.89 and 397,115.90 is: 548,020.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    719,405.58 : 992,779.89 = 397,115.90 : x
  2. Step 2: Convert to fraction form
    719,405.58/992,779.89 = 397,115.90/x
  3. Step 3: Cross multiply
    719,405.58x = 992,779.89 × 397,115.90
  4. Step 4: Simplify right side
    719,405.58x = 394,248,679,022.87
  5. Step 5: Solve for x
    x = 394,248,679,022.87/719,405.58
  6. Step 6: Final answer
    x = 548,020.04

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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.