Home / 20,709.81-28,579.59-11,278.44

Finding the Fourth Proportional to 20,709.81, 28,579.59 and 11,278.44

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Solution

The fourth proportional to 20,709.81, 28,579.59 and 11,278.44 is: 15,564.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,709.81 : 28,579.59 = 11,278.44 : x
  2. Step 2: Convert to fraction form
    20,709.81/28,579.59 = 11,278.44/x
  3. Step 3: Cross multiply
    20,709.81x = 28,579.59 × 11,278.44
  4. Step 4: Simplify right side
    20,709.81x = 322,333,191.04
  5. Step 5: Solve for x
    x = 322,333,191.04/20,709.81
  6. Step 6: Final answer
    x = 15,564.28

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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.