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Finding the Fourth Proportional to 338,816.20, 508,425.90 and 128,475.40

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Solution

The fourth proportional to 338,816.20, 508,425.90 and 128,475.40 is: 192,789.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,816.20 : 508,425.90 = 128,475.40 : x
  2. Step 2: Convert to fraction form
    338,816.20/508,425.90 = 128,475.40/x
  3. Step 3: Cross multiply
    338,816.20x = 508,425.90 × 128,475.40
  4. Step 4: Simplify right side
    338,816.20x = 65,320,220,872.86
  5. Step 5: Solve for x
    x = 65,320,220,872.86/338,816.20
  6. Step 6: Final answer
    x = 192,789.54

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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.