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Finding the Fourth Proportional to 66,539.60, 99,809.40 and 19,786.40

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Solution

The fourth proportional to 66,539.60, 99,809.40 and 19,786.40 is: 29,679.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,539.60 : 99,809.40 = 19,786.40 : x
  2. Step 2: Convert to fraction form
    66,539.60/99,809.40 = 19,786.40/x
  3. Step 3: Cross multiply
    66,539.60x = 99,809.40 × 19,786.40
  4. Step 4: Simplify right side
    66,539.60x = 1,974,868,712.16
  5. Step 5: Solve for x
    x = 1,974,868,712.16/66,539.60
  6. Step 6: Final answer
    x = 29,679.60

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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.