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Finding the Fourth Proportional to 18,978.86, 26,193.15 and 11,429.12

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Solution

The fourth proportional to 18,978.86, 26,193.15 and 11,429.12 is: 15,773.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.86 : 26,193.15 = 11,429.12 : x
  2. Step 2: Convert to fraction form
    18,978.86/26,193.15 = 11,429.12/x
  3. Step 3: Cross multiply
    18,978.86x = 26,193.15 × 11,429.12
  4. Step 4: Simplify right side
    18,978.86x = 299,364,523.56
  5. Step 5: Solve for x
    x = 299,364,523.56/18,978.86
  6. Step 6: Final answer
    x = 15,773.58

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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.