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Finding the Fourth Proportional to 66,411.40, 99,617.10 and 19,664.20

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Solution

The fourth proportional to 66,411.40, 99,617.10 and 19,664.20 is: 29,496.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,411.40 : 99,617.10 = 19,664.20 : x
  2. Step 2: Convert to fraction form
    66,411.40/99,617.10 = 19,664.20/x
  3. Step 3: Cross multiply
    66,411.40x = 99,617.10 × 19,664.20
  4. Step 4: Simplify right side
    66,411.40x = 1,958,890,577.82
  5. Step 5: Solve for x
    x = 1,958,890,577.82/66,411.40
  6. Step 6: Final answer
    x = 29,496.30

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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.