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Finding the Fourth Proportional to 18,761.60, 28,128.48 and 11,364.64

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Solution

The fourth proportional to 18,761.60, 28,128.48 and 11,364.64 is: 17,038.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.60 : 28,128.48 = 11,364.64 : x
  2. Step 2: Convert to fraction form
    18,761.60/28,128.48 = 11,364.64/x
  3. Step 3: Cross multiply
    18,761.60x = 28,128.48 × 11,364.64
  4. Step 4: Simplify right side
    18,761.60x = 319,670,048.95
  5. Step 5: Solve for x
    x = 319,670,048.95/18,761.60
  6. Step 6: Final answer
    x = 17,038.53

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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.