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Finding the Fourth Proportional to 299,617.12, 449,455.70 and 86,390.30

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Solution

The fourth proportional to 299,617.12, 449,455.70 and 86,390.30 is: 129,594.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    299,617.12 : 449,455.70 = 86,390.30 : x
  2. Step 2: Convert to fraction form
    299,617.12/449,455.70 = 86,390.30/x
  3. Step 3: Cross multiply
    299,617.12x = 449,455.70 × 86,390.30
  4. Step 4: Simplify right side
    299,617.12x = 38,828,612,759.71
  5. Step 5: Solve for x
    x = 38,828,612,759.71/299,617.12
  6. Step 6: Final answer
    x = 129,594.11

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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.