Home / 428,787.59-643,274.26-129,243.11

Finding the Fourth Proportional to 428,787.59, 643,274.26 and 129,243.11

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Solution

The fourth proportional to 428,787.59, 643,274.26 and 129,243.11 is: 193,892.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,787.59 : 643,274.26 = 129,243.11 : x
  2. Step 2: Convert to fraction form
    428,787.59/643,274.26 = 129,243.11/x
  3. Step 3: Cross multiply
    428,787.59x = 643,274.26 × 129,243.11
  4. Step 4: Simplify right side
    428,787.59x = 83,138,762,405.87
  5. Step 5: Solve for x
    x = 83,138,762,405.87/428,787.59
  6. Step 6: Final answer
    x = 193,892.65

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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.