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Finding the Fourth Proportional to 438,418.80, 657,628.20 and 320,320.80

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Solution

The fourth proportional to 438,418.80, 657,628.20 and 320,320.80 is: 480,481.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,418.80 : 657,628.20 = 320,320.80 : x
  2. Step 2: Convert to fraction form
    438,418.80/657,628.20 = 320,320.80/x
  3. Step 3: Cross multiply
    438,418.80x = 657,628.20 × 320,320.80
  4. Step 4: Simplify right side
    438,418.80x = 210,651,991,126.56
  5. Step 5: Solve for x
    x = 210,651,991,126.56/438,418.80
  6. Step 6: Final answer
    x = 480,481.20

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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.