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Finding the Fourth Proportional to 66,699.60, 100,015.20 and 19,946.40

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Solution

The fourth proportional to 66,699.60, 100,015.20 and 19,946.40 is: 29,909.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,699.60 : 100,015.20 = 19,946.40 : x
  2. Step 2: Convert to fraction form
    66,699.60/100,015.20 = 19,946.40/x
  3. Step 3: Cross multiply
    66,699.60x = 100,015.20 × 19,946.40
  4. Step 4: Simplify right side
    66,699.60x = 1,994,943,185.28
  5. Step 5: Solve for x
    x = 1,994,943,185.28/66,699.60
  6. Step 6: Final answer
    x = 29,909.37

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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.