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Finding the Fourth Proportional to 20,636.56, 28,478 and 11,205.12

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Solution

The fourth proportional to 20,636.56, 28,478 and 11,205.12 is: 15,462.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,636.56 : 28,478 = 11,205.12 : x
  2. Step 2: Convert to fraction form
    20,636.56/28,478 = 11,205.12/x
  3. Step 3: Cross multiply
    20,636.56x = 28,478 × 11,205.12
  4. Step 4: Simplify right side
    20,636.56x = 319,099,407.36
  5. Step 5: Solve for x
    x = 319,099,407.36/20,636.56
  6. Step 6: Final answer
    x = 15,462.82

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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.