Home / 428,924.38-643,391.20-129,407.56

Finding the Fourth Proportional to 428,924.38, 643,391.20 and 129,407.56

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Solution

The fourth proportional to 428,924.38, 643,391.20 and 129,407.56 is: 194,112.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,924.38 : 643,391.20 = 129,407.56 : x
  2. Step 2: Convert to fraction form
    428,924.38/643,391.20 = 129,407.56/x
  3. Step 3: Cross multiply
    428,924.38x = 643,391.20 × 129,407.56
  4. Step 4: Simplify right side
    428,924.38x = 83,259,685,317.47
  5. Step 5: Solve for x
    x = 83,259,685,317.47/428,924.38
  6. Step 6: Final answer
    x = 194,112.74

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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.