Home / 20,636.78-28,478.21-11,685.15

Finding the Fourth Proportional to 20,636.78, 28,478.21 and 11,685.15

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Solution

The fourth proportional to 20,636.78, 28,478.21 and 11,685.15 is: 16,125.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,636.78 : 28,478.21 = 11,685.15 : x
  2. Step 2: Convert to fraction form
    20,636.78/28,478.21 = 11,685.15/x
  3. Step 3: Cross multiply
    20,636.78x = 28,478.21 × 11,685.15
  4. Step 4: Simplify right side
    20,636.78x = 332,772,097.16
  5. Step 5: Solve for x
    x = 332,772,097.16/20,636.78
  6. Step 6: Final answer
    x = 16,125.20

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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.