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Finding the Fourth Proportional to 321,021.90, 481,729.68 and 143,678.88

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Solution

The fourth proportional to 321,021.90, 481,729.68 and 143,678.88 is: 215,606.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,021.90 : 481,729.68 = 143,678.88 : x
  2. Step 2: Convert to fraction form
    321,021.90/481,729.68 = 143,678.88/x
  3. Step 3: Cross multiply
    321,021.90x = 481,729.68 × 143,678.88
  4. Step 4: Simplify right side
    321,021.90x = 69,214,380,885.16
  5. Step 5: Solve for x
    x = 69,214,380,885.16/321,021.90
  6. Step 6: Final answer
    x = 215,606.41

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1.5x scale

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.