Home / 428,631.20-642,703.80-162,400.40

Finding the Fourth Proportional to 428,631.20, 642,703.80 and 162,400.40

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Solution

The fourth proportional to 428,631.20, 642,703.80 and 162,400.40 is: 243,508.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,631.20 : 642,703.80 = 162,400.40 : x
  2. Step 2: Convert to fraction form
    428,631.20/642,703.80 = 162,400.40/x
  3. Step 3: Cross multiply
    428,631.20x = 642,703.80 × 162,400.40
  4. Step 4: Simplify right side
    428,631.20x = 104,375,354,201.52
  5. Step 5: Solve for x
    x = 104,375,354,201.52/428,631.20
  6. Step 6: Final answer
    x = 243,508.53

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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.