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Finding the Fourth Proportional to 423,765.71, 635,409.36 and 139,379.37

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Solution

The fourth proportional to 423,765.71, 635,409.36 and 139,379.37 is: 208,990.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,765.71 : 635,409.36 = 139,379.37 : x
  2. Step 2: Convert to fraction form
    423,765.71/635,409.36 = 139,379.37/x
  3. Step 3: Cross multiply
    423,765.71x = 635,409.36 × 139,379.37
  4. Step 4: Simplify right side
    423,765.71x = 88,562,953,906.12
  5. Step 5: Solve for x
    x = 88,562,953,906.12/423,765.71
  6. Step 6: Final answer
    x = 208,990.37

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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.