Home / 20,772.36-28,666.80-11,820.78

Finding the Fourth Proportional to 20,772.36, 28,666.80 and 11,820.78

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Solution

The fourth proportional to 20,772.36, 28,666.80 and 11,820.78 is: 16,313.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,772.36 : 28,666.80 = 11,820.78 : x
  2. Step 2: Convert to fraction form
    20,772.36/28,666.80 = 11,820.78/x
  3. Step 3: Cross multiply
    20,772.36x = 28,666.80 × 11,820.78
  4. Step 4: Simplify right side
    20,772.36x = 338,863,936.10
  5. Step 5: Solve for x
    x = 338,863,936.10/20,772.36
  6. Step 6: Final answer
    x = 16,313.21

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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.