Home / 428,961.19-643,446.34-129,444.40

Finding the Fourth Proportional to 428,961.19, 643,446.34 and 129,444.40

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Solution

The fourth proportional to 428,961.19, 643,446.34 and 129,444.40 is: 194,167.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,961.19 : 643,446.34 = 129,444.40 : x
  2. Step 2: Convert to fraction form
    428,961.19/643,446.34 = 129,444.40/x
  3. Step 3: Cross multiply
    428,961.19x = 643,446.34 × 129,444.40
  4. Step 4: Simplify right side
    428,961.19x = 83,290,525,413.50
  5. Step 5: Solve for x
    x = 83,290,525,413.50/428,961.19
  6. Step 6: Final answer
    x = 194,167.97

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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.