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Finding the Fourth Proportional to 21,245.25, 29,325.75 and 12,861.75

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Solution

The fourth proportional to 21,245.25, 29,325.75 and 12,861.75 is: 17,753.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,245.25 : 29,325.75 = 12,861.75 : x
  2. Step 2: Convert to fraction form
    21,245.25/29,325.75 = 12,861.75/x
  3. Step 3: Cross multiply
    21,245.25x = 29,325.75 × 12,861.75
  4. Step 4: Simplify right side
    21,245.25x = 377,180,465.06
  5. Step 5: Solve for x
    x = 377,180,465.06/21,245.25
  6. Step 6: Final answer
    x = 17,753.64

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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.