Home / 13,638.89-20,458.29-4,278.98

Finding the Fourth Proportional to 13,638.89, 20,458.29 and 4,278.98

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Solution

The fourth proportional to 13,638.89, 20,458.29 and 4,278.98 is: 6,418.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638.89 : 20,458.29 = 4,278.98 : x
  2. Step 2: Convert to fraction form
    13,638.89/20,458.29 = 4,278.98/x
  3. Step 3: Cross multiply
    13,638.89x = 20,458.29 × 4,278.98
  4. Step 4: Simplify right side
    13,638.89x = 87,540,613.74
  5. Step 5: Solve for x
    x = 87,540,613.74/13,638.89
  6. Step 6: Final answer
    x = 6,418.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.