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Finding the Fourth Proportional to 528,002.20, 792,003.30 and 428,469.40

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Solution

The fourth proportional to 528,002.20, 792,003.30 and 428,469.40 is: 642,704.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,002.20 : 792,003.30 = 428,469.40 : x
  2. Step 2: Convert to fraction form
    528,002.20/792,003.30 = 428,469.40/x
  3. Step 3: Cross multiply
    528,002.20x = 792,003.30 × 428,469.40
  4. Step 4: Simplify right side
    528,002.20x = 339,349,178,749.02
  5. Step 5: Solve for x
    x = 339,349,178,749.02/528,002.20
  6. Step 6: Final answer
    x = 642,704.10

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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.