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Finding the Fourth Proportional to 428,652,027.20, 642,978,040.80 and 425,628,718.40

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Solution

The fourth proportional to 428,652,027.20, 642,978,040.80 and 425,628,718.40 is: 638,443,077.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,652,027.20 : 642,978,040.80 = 425,628,718.40 : x
  2. Step 2: Convert to fraction form
    428,652,027.20/642,978,040.80 = 425,628,718.40/x
  3. Step 3: Cross multiply
    428,652,027.20x = 642,978,040.80 × 425,628,718.40
  4. Step 4: Simplify right side
    428,652,027.20x = 273,669,919,465,046,880
  5. Step 5: Solve for x
    x = 273,669,919,465,046,880/428,652,027.20
  6. Step 6: Final answer
    x = 638,443,077.60

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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.