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Finding the Fourth Proportional to 21,620.90, 29,807.19 and 13,659.14

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Solution

The fourth proportional to 21,620.90, 29,807.19 and 13,659.14 is: 18,830.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,620.90 : 29,807.19 = 13,659.14 : x
  2. Step 2: Convert to fraction form
    21,620.90/29,807.19 = 13,659.14/x
  3. Step 3: Cross multiply
    21,620.90x = 29,807.19 × 13,659.14
  4. Step 4: Simplify right side
    21,620.90x = 407,140,581.22
  5. Step 5: Solve for x
    x = 407,140,581.22/21,620.90
  6. Step 6: Final answer
    x = 18,830.88

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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.