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Finding the Fourth Proportional to 338,920.20, 508,380.30 and 128,530.80

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Solution

The fourth proportional to 338,920.20, 508,380.30 and 128,530.80 is: 192,796.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,920.20 : 508,380.30 = 128,530.80 : x
  2. Step 2: Convert to fraction form
    338,920.20/508,380.30 = 128,530.80/x
  3. Step 3: Cross multiply
    338,920.20x = 508,380.30 × 128,530.80
  4. Step 4: Simplify right side
    338,920.20x = 65,342,526,663.24
  5. Step 5: Solve for x
    x = 65,342,526,663.24/338,920.20
  6. Step 6: Final answer
    x = 192,796.20

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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.