Home / 428,923.38-643,389.70-129,406.56

Finding the Fourth Proportional to 428,923.38, 643,389.70 and 129,406.56

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Solution

The fourth proportional to 428,923.38, 643,389.70 and 129,406.56 is: 194,111.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,923.38 : 643,389.70 = 129,406.56 : x
  2. Step 2: Convert to fraction form
    428,923.38/643,389.70 = 129,406.56/x
  3. Step 3: Cross multiply
    428,923.38x = 643,389.70 × 129,406.56
  4. Step 4: Simplify right side
    428,923.38x = 83,258,847,816.43
  5. Step 5: Solve for x
    x = 83,258,847,816.43/428,923.38
  6. Step 6: Final answer
    x = 194,111.24

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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.