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Finding the Fourth Proportional to 13,884.64, 20,827.90 and 5,120.16

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Solution

The fourth proportional to 13,884.64, 20,827.90 and 5,120.16 is: 7,680.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,884.64 : 20,827.90 = 5,120.16 : x
  2. Step 2: Convert to fraction form
    13,884.64/20,827.90 = 5,120.16/x
  3. Step 3: Cross multiply
    13,884.64x = 20,827.90 × 5,120.16
  4. Step 4: Simplify right side
    13,884.64x = 106,642,180.46
  5. Step 5: Solve for x
    x = 106,642,180.46/13,884.64
  6. Step 6: Final answer
    x = 7,680.59

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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.