Home / 20,478.66-28,261.71-12,519.60

Finding the Fourth Proportional to 20,478.66, 28,261.71 and 12,519.60

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Solution

The fourth proportional to 20,478.66, 28,261.71 and 12,519.60 is: 17,277.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.66 : 28,261.71 = 12,519.60 : x
  2. Step 2: Convert to fraction form
    20,478.66/28,261.71 = 12,519.60/x
  3. Step 3: Cross multiply
    20,478.66x = 28,261.71 × 12,519.60
  4. Step 4: Simplify right side
    20,478.66x = 353,825,304.52
  5. Step 5: Solve for x
    x = 353,825,304.52/20,478.66
  6. Step 6: Final answer
    x = 17,277.76

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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.