Home / 20,778.41-28,656.11-13,507.42

Finding the Fourth Proportional to 20,778.41, 28,656.11 and 13,507.42

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Solution

The fourth proportional to 20,778.41, 28,656.11 and 13,507.42 is: 18,628.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.41 : 28,656.11 = 13,507.42 : x
  2. Step 2: Convert to fraction form
    20,778.41/28,656.11 = 13,507.42/x
  3. Step 3: Cross multiply
    20,778.41x = 28,656.11 × 13,507.42
  4. Step 4: Simplify right side
    20,778.41x = 387,070,113.34
  5. Step 5: Solve for x
    x = 387,070,113.34/20,778.41
  6. Step 6: Final answer
    x = 18,628.48

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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.