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Finding the Fourth Proportional to 428,652,023.70, 642,978,035.55 and 425,628,714.90

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Solution

The fourth proportional to 428,652,023.70, 642,978,035.55 and 425,628,714.90 is: 638,443,072.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,652,023.70 : 642,978,035.55 = 425,628,714.90 : x
  2. Step 2: Convert to fraction form
    428,652,023.70/642,978,035.55 = 425,628,714.90/x
  3. Step 3: Cross multiply
    428,652,023.70x = 642,978,035.55 × 425,628,714.90
  4. Step 4: Simplify right side
    428,652,023.70x = 273,669,914,980,072,992
  5. Step 5: Solve for x
    x = 273,669,914,980,072,992/428,652,023.70
  6. Step 6: Final answer
    x = 638,443,072.35

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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.