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Finding the Fourth Proportional to 81,162.90, 122,018.54 and 65,560.68

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Solution

The fourth proportional to 81,162.90, 122,018.54 and 65,560.68 is: 98,562.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,162.90 : 122,018.54 = 65,560.68 : x
  2. Step 2: Convert to fraction form
    81,162.90/122,018.54 = 65,560.68/x
  3. Step 3: Cross multiply
    81,162.90x = 122,018.54 × 65,560.68
  4. Step 4: Simplify right side
    81,162.90x = 7,999,618,127.20
  5. Step 5: Solve for x
    x = 7,999,618,127.20/81,162.90
  6. Step 6: Final answer
    x = 98,562.50

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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.