Home / 428,975.97-643,468.55-129,459.24

Finding the Fourth Proportional to 428,975.97, 643,468.55 and 129,459.24

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Solution

The fourth proportional to 428,975.97, 643,468.55 and 129,459.24 is: 194,190.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,975.97 : 643,468.55 = 129,459.24 : x
  2. Step 2: Convert to fraction form
    428,975.97/643,468.55 = 129,459.24/x
  3. Step 3: Cross multiply
    428,975.97x = 643,468.55 × 129,459.24
  4. Step 4: Simplify right side
    428,975.97x = 83,302,946,229.56
  5. Step 5: Solve for x
    x = 83,302,946,229.56/428,975.97
  6. Step 6: Final answer
    x = 194,190.24

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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.