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Finding the Fourth Proportional to 18,819.13, 25,971.63 and 10,861.90

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Solution

The fourth proportional to 18,819.13, 25,971.63 and 10,861.90 is: 14,990.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,819.13 : 25,971.63 = 10,861.90 : x
  2. Step 2: Convert to fraction form
    18,819.13/25,971.63 = 10,861.90/x
  3. Step 3: Cross multiply
    18,819.13x = 25,971.63 × 10,861.90
  4. Step 4: Simplify right side
    18,819.13x = 282,101,247.90
  5. Step 5: Solve for x
    x = 282,101,247.90/18,819.13
  6. Step 6: Final answer
    x = 14,990.13

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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.