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Finding the Fourth Proportional to 13,818.64, 20,721.86 and 3,955.68

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Solution

The fourth proportional to 13,818.64, 20,721.86 and 3,955.68 is: 5,931.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,818.64 : 20,721.86 = 3,955.68 : x
  2. Step 2: Convert to fraction form
    13,818.64/20,721.86 = 3,955.68/x
  3. Step 3: Cross multiply
    13,818.64x = 20,721.86 × 3,955.68
  4. Step 4: Simplify right side
    13,818.64x = 81,969,047.16
  5. Step 5: Solve for x
    x = 81,969,047.16/13,818.64
  6. Step 6: Final answer
    x = 5,931.77

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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.