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Finding the Fourth Proportional to 398,388.37, 597,699.34 and 128,511.12

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Solution

The fourth proportional to 398,388.37, 597,699.34 and 128,511.12 is: 192,804.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,388.37 : 597,699.34 = 128,511.12 : x
  2. Step 2: Convert to fraction form
    398,388.37/597,699.34 = 128,511.12/x
  3. Step 3: Cross multiply
    398,388.37x = 597,699.34 × 128,511.12
  4. Step 4: Simplify right side
    398,388.37x = 76,811,013,422.19
  5. Step 5: Solve for x
    x = 76,811,013,422.19/398,388.37
  6. Step 6: Final answer
    x = 192,804.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.