Home / 428,766.36-643,179.60-129,249.40

Finding the Fourth Proportional to 428,766.36, 643,179.60 and 129,249.40

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Solution

The fourth proportional to 428,766.36, 643,179.60 and 129,249.40 is: 193,883.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,766.36 : 643,179.60 = 129,249.40 : x
  2. Step 2: Convert to fraction form
    428,766.36/643,179.60 = 129,249.40/x
  3. Step 3: Cross multiply
    428,766.36x = 643,179.60 × 129,249.40
  4. Step 4: Simplify right side
    428,766.36x = 83,130,577,392.24
  5. Step 5: Solve for x
    x = 83,130,577,392.24/428,766.36
  6. Step 6: Final answer
    x = 193,883.16

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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.