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Finding the Fourth Proportional to 421,720.80, 632,581.20 and 280,003.20

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Solution

The fourth proportional to 421,720.80, 632,581.20 and 280,003.20 is: 420,004.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,720.80 : 632,581.20 = 280,003.20 : x
  2. Step 2: Convert to fraction form
    421,720.80/632,581.20 = 280,003.20/x
  3. Step 3: Cross multiply
    421,720.80x = 632,581.20 × 280,003.20
  4. Step 4: Simplify right side
    421,720.80x = 177,124,760,259.84
  5. Step 5: Solve for x
    x = 177,124,760,259.84/421,720.80
  6. Step 6: Final answer
    x = 420,004.80

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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.