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Finding the Fourth Proportional to 18,761.76, 28,111.40 and 13,203.44

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Solution

The fourth proportional to 18,761.76, 28,111.40 and 13,203.44 is: 19,783.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.76 : 28,111.40 = 13,203.44 : x
  2. Step 2: Convert to fraction form
    18,761.76/28,111.40 = 13,203.44/x
  3. Step 3: Cross multiply
    18,761.76x = 28,111.40 × 13,203.44
  4. Step 4: Simplify right side
    18,761.76x = 371,167,205.84
  5. Step 5: Solve for x
    x = 371,167,205.84/18,761.76
  6. Step 6: Final answer
    x = 19,783.18

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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.