Home / 428,768.36-643,182.60-129,251.40

Finding the Fourth Proportional to 428,768.36, 643,182.60 and 129,251.40

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Solution

The fourth proportional to 428,768.36, 643,182.60 and 129,251.40 is: 193,886.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,768.36 : 643,182.60 = 129,251.40 : x
  2. Step 2: Convert to fraction form
    428,768.36/643,182.60 = 129,251.40/x
  3. Step 3: Cross multiply
    428,768.36x = 643,182.60 × 129,251.40
  4. Step 4: Simplify right side
    428,768.36x = 83,132,251,505.64
  5. Step 5: Solve for x
    x = 83,132,251,505.64/428,768.36
  6. Step 6: Final answer
    x = 193,886.16

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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.