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Finding the Fourth Proportional to 153,173.90, 211,378.11 and 86,105.90

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Solution

The fourth proportional to 153,173.90, 211,378.11 and 86,105.90 is: 118,825.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,173.90 : 211,378.11 = 86,105.90 : x
  2. Step 2: Convert to fraction form
    153,173.90/211,378.11 = 86,105.90/x
  3. Step 3: Cross multiply
    153,173.90x = 211,378.11 × 86,105.90
  4. Step 4: Simplify right side
    153,173.90x = 18,200,902,401.85
  5. Step 5: Solve for x
    x = 18,200,902,401.85/153,173.90
  6. Step 6: Final answer
    x = 118,825.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.