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Finding the Fourth Proportional to 428,450.76, 642,042.60 and 404,486.70

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Solution

The fourth proportional to 428,450.76, 642,042.60 and 404,486.70 is: 606,131.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,450.76 : 642,042.60 = 404,486.70 : x
  2. Step 2: Convert to fraction form
    428,450.76/642,042.60 = 404,486.70/x
  3. Step 3: Cross multiply
    428,450.76x = 642,042.60 × 404,486.70
  4. Step 4: Simplify right side
    428,450.76x = 259,697,692,533.42
  5. Step 5: Solve for x
    x = 259,697,692,533.42/428,450.76
  6. Step 6: Final answer
    x = 606,131.95

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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.