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Finding the Fourth Proportional to 18,761.40, 28,128.16 and 11,364.12

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Solution

The fourth proportional to 18,761.40, 28,128.16 and 11,364.12 is: 17,037.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.40 : 28,128.16 = 11,364.12 : x
  2. Step 2: Convert to fraction form
    18,761.40/28,128.16 = 11,364.12/x
  3. Step 3: Cross multiply
    18,761.40x = 28,128.16 × 11,364.12
  4. Step 4: Simplify right side
    18,761.40x = 319,651,785.62
  5. Step 5: Solve for x
    x = 319,651,785.62/18,761.40
  6. Step 6: Final answer
    x = 17,037.74

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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.