Home / 20,656.80-28,497.60-12,696.48

Finding the Fourth Proportional to 20,656.80, 28,497.60 and 12,696.48

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Solution

The fourth proportional to 20,656.80, 28,497.60 and 12,696.48 is: 17,515.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,656.80 : 28,497.60 = 12,696.48 : x
  2. Step 2: Convert to fraction form
    20,656.80/28,497.60 = 12,696.48/x
  3. Step 3: Cross multiply
    20,656.80x = 28,497.60 × 12,696.48
  4. Step 4: Simplify right side
    20,656.80x = 361,819,208.45
  5. Step 5: Solve for x
    x = 361,819,208.45/20,656.80
  6. Step 6: Final answer
    x = 17,515.74

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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.