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Finding the Third Proportional to 428,143.50 and 666,729.75

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Solution

The third proportional to 428,143.50 and 666,729.75 is: 1,038,270.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,143.50 : 666,729.75 = 666,729.75 : x
  2. Step 2: Convert to fraction form
    428,143.50/666,729.75 = 666,729.75/x
  3. Step 3: Cross multiply
    428,143.50x = 666,729.75 × 666,729.75
  4. Step 4: Simplify right side
    428,143.50x = 444,528,559,535.06
  5. Step 5: Solve for x
    x = 444,528,559,535.06/428,143.50
  6. Step 6: Final answer
    x = 1,038,270.02

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.