Home / 20,666.80-28,493.78-13,386.04

Finding the Fourth Proportional to 20,666.80, 28,493.78 and 13,386.04

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Solution

The fourth proportional to 20,666.80, 28,493.78 and 13,386.04 is: 18,455.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,666.80 : 28,493.78 = 13,386.04 : x
  2. Step 2: Convert to fraction form
    20,666.80/28,493.78 = 13,386.04/x
  3. Step 3: Cross multiply
    20,666.80x = 28,493.78 × 13,386.04
  4. Step 4: Simplify right side
    20,666.80x = 381,418,918.96
  5. Step 5: Solve for x
    x = 381,418,918.96/20,666.80
  6. Step 6: Final answer
    x = 18,455.63

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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.