Home / 20,505.39-28,297.31-11,555.77

Finding the Fourth Proportional to 20,505.39, 28,297.31 and 11,555.77

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Solution

The fourth proportional to 20,505.39, 28,297.31 and 11,555.77 is: 15,946.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,505.39 : 28,297.31 = 11,555.77 : x
  2. Step 2: Convert to fraction form
    20,505.39/28,297.31 = 11,555.77/x
  3. Step 3: Cross multiply
    20,505.39x = 28,297.31 × 11,555.77
  4. Step 4: Simplify right side
    20,505.39x = 326,997,064.49
  5. Step 5: Solve for x
    x = 326,997,064.49/20,505.39
  6. Step 6: Final answer
    x = 15,946.88

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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.