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Finding the Fourth Proportional to 338,860.20, 508,491.90 and 128,519.40

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Solution

The fourth proportional to 338,860.20, 508,491.90 and 128,519.40 is: 192,855.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,860.20 : 508,491.90 = 128,519.40 : x
  2. Step 2: Convert to fraction form
    338,860.20/508,491.90 = 128,519.40/x
  3. Step 3: Cross multiply
    338,860.20x = 508,491.90 × 128,519.40
  4. Step 4: Simplify right side
    338,860.20x = 65,351,073,892.86
  5. Step 5: Solve for x
    x = 65,351,073,892.86/338,860.20
  6. Step 6: Final answer
    x = 192,855.56

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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.