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Finding the Fourth Proportional to 66,351, 91,567.34 and 39,128.18

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Solution

The fourth proportional to 66,351, 91,567.34 and 39,128.18 is: 53,998.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,351 : 91,567.34 = 39,128.18 : x
  2. Step 2: Convert to fraction form
    66,351/91,567.34 = 39,128.18/x
  3. Step 3: Cross multiply
    66,351x = 91,567.34 × 39,128.18
  4. Step 4: Simplify right side
    66,351x = 3,582,863,361.64
  5. Step 5: Solve for x
    x = 3,582,863,361.64/66,351
  6. Step 6: Final answer
    x = 53,998.63

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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.