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Finding the Fourth Proportional to 20,695.68, 28,555.68 and 13,536.09

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Solution

The fourth proportional to 20,695.68, 28,555.68 and 13,536.09 is: 18,676.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,695.68 : 28,555.68 = 13,536.09 : x
  2. Step 2: Convert to fraction form
    20,695.68/28,555.68 = 13,536.09/x
  3. Step 3: Cross multiply
    20,695.68x = 28,555.68 × 13,536.09
  4. Step 4: Simplify right side
    20,695.68x = 386,532,254.49
  5. Step 5: Solve for x
    x = 386,532,254.49/20,695.68
  6. Step 6: Final answer
    x = 18,676.95

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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.