Home / 20,777.78-28,655.25-13,506.80

Finding the Fourth Proportional to 20,777.78, 28,655.25 and 13,506.80

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Solution

The fourth proportional to 20,777.78, 28,655.25 and 13,506.80 is: 18,627.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,777.78 : 28,655.25 = 13,506.80 : x
  2. Step 2: Convert to fraction form
    20,777.78/28,655.25 = 13,506.80/x
  3. Step 3: Cross multiply
    20,777.78x = 28,655.25 × 13,506.80
  4. Step 4: Simplify right side
    20,777.78x = 387,040,587.42
  5. Step 5: Solve for x
    x = 387,040,587.42/20,777.78
  6. Step 6: Final answer
    x = 18,627.62

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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.