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Finding the Fourth Proportional to 18,917.20, 26,105.52 and 10,420.10

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Solution

The fourth proportional to 18,917.20, 26,105.52 and 10,420.10 is: 14,379.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.20 : 26,105.52 = 10,420.10 : x
  2. Step 2: Convert to fraction form
    18,917.20/26,105.52 = 10,420.10/x
  3. Step 3: Cross multiply
    18,917.20x = 26,105.52 × 10,420.10
  4. Step 4: Simplify right side
    18,917.20x = 272,022,128.95
  5. Step 5: Solve for x
    x = 272,022,128.95/18,917.20
  6. Step 6: Final answer
    x = 14,379.62

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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.