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Finding the Fourth Proportional to 13,661.16, 18,840.69 and 8,282.31

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Solution

The fourth proportional to 13,661.16, 18,840.69 and 8,282.31 is: 11,422.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,661.16 : 18,840.69 = 8,282.31 : x
  2. Step 2: Convert to fraction form
    13,661.16/18,840.69 = 8,282.31/x
  3. Step 3: Cross multiply
    13,661.16x = 18,840.69 × 8,282.31
  4. Step 4: Simplify right side
    13,661.16x = 156,044,435.19
  5. Step 5: Solve for x
    x = 156,044,435.19/13,661.16
  6. Step 6: Final answer
    x = 11,422.49

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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.