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Finding the Fourth Proportional to 71,679.01, 98,919.58 and 39,416.09

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Solution

The fourth proportional to 71,679.01, 98,919.58 and 39,416.09 is: 54,395.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,679.01 : 98,919.58 = 39,416.09 : x
  2. Step 2: Convert to fraction form
    71,679.01/98,919.58 = 39,416.09/x
  3. Step 3: Cross multiply
    71,679.01x = 98,919.58 × 39,416.09
  4. Step 4: Simplify right side
    71,679.01x = 3,899,023,068.04
  5. Step 5: Solve for x
    x = 3,899,023,068.04/71,679.01
  6. Step 6: Final answer
    x = 54,395.60

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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.