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Finding the Fourth Proportional to 398,556.40, 597,951.06 and 128,678.20

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Solution

The fourth proportional to 398,556.40, 597,951.06 and 128,678.20 is: 193,054.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,556.40 : 597,951.06 = 128,678.20 : x
  2. Step 2: Convert to fraction form
    398,556.40/597,951.06 = 128,678.20/x
  3. Step 3: Cross multiply
    398,556.40x = 597,951.06 × 128,678.20
  4. Step 4: Simplify right side
    398,556.40x = 76,943,266,088.89
  5. Step 5: Solve for x
    x = 76,943,266,088.89/398,556.40
  6. Step 6: Final answer
    x = 193,054.90

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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.