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Finding the Fourth Proportional to 65,733.60, 98,600.40 and 18,991.20

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Solution

The fourth proportional to 65,733.60, 98,600.40 and 18,991.20 is: 28,486.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,733.60 : 98,600.40 = 18,991.20 : x
  2. Step 2: Convert to fraction form
    65,733.60/98,600.40 = 18,991.20/x
  3. Step 3: Cross multiply
    65,733.60x = 98,600.40 × 18,991.20
  4. Step 4: Simplify right side
    65,733.60x = 1,872,539,916.48
  5. Step 5: Solve for x
    x = 1,872,539,916.48/65,733.60
  6. Step 6: Final answer
    x = 28,486.80

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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.