Home / 428,850.34-643,067.52-129,275.08

Finding the Fourth Proportional to 428,850.34, 643,067.52 and 129,275.08

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Solution

The fourth proportional to 428,850.34, 643,067.52 and 129,275.08 is: 193,849.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,850.34 : 643,067.52 = 129,275.08 : x
  2. Step 2: Convert to fraction form
    428,850.34/643,067.52 = 129,275.08/x
  3. Step 3: Cross multiply
    428,850.34x = 643,067.52 × 129,275.08
  4. Step 4: Simplify right side
    428,850.34x = 83,132,605,093.40
  5. Step 5: Solve for x
    x = 83,132,605,093.40/428,850.34
  6. Step 6: Final answer
    x = 193,849.92

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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.