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Finding the Fourth Proportional to 18,717.99, 25,830.98 and 10,219.90

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Solution

The fourth proportional to 18,717.99, 25,830.98 and 10,219.90 is: 14,103.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,717.99 : 25,830.98 = 10,219.90 : x
  2. Step 2: Convert to fraction form
    18,717.99/25,830.98 = 10,219.90/x
  3. Step 3: Cross multiply
    18,717.99x = 25,830.98 × 10,219.90
  4. Step 4: Simplify right side
    18,717.99x = 263,989,902.19
  5. Step 5: Solve for x
    x = 263,989,902.19/18,717.99
  6. Step 6: Final answer
    x = 14,103.54

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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.