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Finding the Fourth Proportional to 11,219.40, 16,818.30 and 8,719.20

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Solution

The fourth proportional to 11,219.40, 16,818.30 and 8,719.20 is: 13,070.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,219.40 : 16,818.30 = 8,719.20 : x
  2. Step 2: Convert to fraction form
    11,219.40/16,818.30 = 8,719.20/x
  3. Step 3: Cross multiply
    11,219.40x = 16,818.30 × 8,719.20
  4. Step 4: Simplify right side
    11,219.40x = 146,642,121.36
  5. Step 5: Solve for x
    x = 146,642,121.36/11,219.40
  6. Step 6: Final answer
    x = 13,070.41

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1.5x scale

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.