Home / 428,636.20-642,711.30-162,405.40

Finding the Fourth Proportional to 428,636.20, 642,711.30 and 162,405.40

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Solution

The fourth proportional to 428,636.20, 642,711.30 and 162,405.40 is: 243,516.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,636.20 : 642,711.30 = 162,405.40 : x
  2. Step 2: Convert to fraction form
    428,636.20/642,711.30 = 162,405.40/x
  3. Step 3: Cross multiply
    428,636.20x = 642,711.30 × 162,405.40
  4. Step 4: Simplify right side
    428,636.20x = 104,379,785,761.02
  5. Step 5: Solve for x
    x = 104,379,785,761.02/428,636.20
  6. Step 6: Final answer
    x = 243,516.03

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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.