Home / 20,780.60-28,677.80-11,349.76

Finding the Fourth Proportional to 20,780.60, 28,677.80 and 11,349.76

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Solution

The fourth proportional to 20,780.60, 28,677.80 and 11,349.76 is: 15,662.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.60 : 28,677.80 = 11,349.76 : x
  2. Step 2: Convert to fraction form
    20,780.60/28,677.80 = 11,349.76/x
  3. Step 3: Cross multiply
    20,780.60x = 28,677.80 × 11,349.76
  4. Step 4: Simplify right side
    20,780.60x = 325,486,147.33
  5. Step 5: Solve for x
    x = 325,486,147.33/20,780.60
  6. Step 6: Final answer
    x = 15,662.98

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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.