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Finding the Fourth Proportional to 13,921.16, 20,881.80 and 3,532.91

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Solution

The fourth proportional to 13,921.16, 20,881.80 and 3,532.91 is: 5,299.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,921.16 : 20,881.80 = 3,532.91 : x
  2. Step 2: Convert to fraction form
    13,921.16/20,881.80 = 3,532.91/x
  3. Step 3: Cross multiply
    13,921.16x = 20,881.80 × 3,532.91
  4. Step 4: Simplify right side
    13,921.16x = 73,773,415.63
  5. Step 5: Solve for x
    x = 73,773,415.63/13,921.16
  6. Step 6: Final answer
    x = 5,299.37

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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.