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Finding the Fourth Proportional to 339,289.20, 508,780.20 and 128,857.20

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Solution

The fourth proportional to 339,289.20, 508,780.20 and 128,857.20 is: 193,227.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,289.20 : 508,780.20 = 128,857.20 : x
  2. Step 2: Convert to fraction form
    339,289.20/508,780.20 = 128,857.20/x
  3. Step 3: Cross multiply
    339,289.20x = 508,780.20 × 128,857.20
  4. Step 4: Simplify right side
    339,289.20x = 65,559,991,987.44
  5. Step 5: Solve for x
    x = 65,559,991,987.44/339,289.20
  6. Step 6: Final answer
    x = 193,227.46

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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.