Home / 428,958.77-643,421.97-129,431.36

Finding the Fourth Proportional to 428,958.77, 643,421.97 and 129,431.36

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Solution

The fourth proportional to 428,958.77, 643,421.97 and 129,431.36 is: 194,142.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,958.77 : 643,421.97 = 129,431.36 : x
  2. Step 2: Convert to fraction form
    428,958.77/643,421.97 = 129,431.36/x
  3. Step 3: Cross multiply
    428,958.77x = 643,421.97 × 129,431.36
  4. Step 4: Simplify right side
    428,958.77x = 83,278,977,413.87
  5. Step 5: Solve for x
    x = 83,278,977,413.87/428,958.77
  6. Step 6: Final answer
    x = 194,142.15

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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.