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Finding the Fourth Proportional to 619,999.20, 930,128.40 and 199,317.60

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Solution

The fourth proportional to 619,999.20, 930,128.40 and 199,317.60 is: 299,018.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,999.20 : 930,128.40 = 199,317.60 : x
  2. Step 2: Convert to fraction form
    619,999.20/930,128.40 = 199,317.60/x
  3. Step 3: Cross multiply
    619,999.20x = 930,128.40 × 199,317.60
  4. Step 4: Simplify right side
    619,999.20x = 185,390,960,379.84
  5. Step 5: Solve for x
    x = 185,390,960,379.84/619,999.20
  6. Step 6: Final answer
    x = 299,018.06

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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.