Home / 20,709.50-28,579.07-11,278.06

Finding the Fourth Proportional to 20,709.50, 28,579.07 and 11,278.06

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Solution

The fourth proportional to 20,709.50, 28,579.07 and 11,278.06 is: 15,563.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,709.50 : 28,579.07 = 11,278.06 : x
  2. Step 2: Convert to fraction form
    20,709.50/28,579.07 = 11,278.06/x
  3. Step 3: Cross multiply
    20,709.50x = 28,579.07 × 11,278.06
  4. Step 4: Simplify right side
    20,709.50x = 322,316,422.95
  5. Step 5: Solve for x
    x = 322,316,422.95/20,709.50
  6. Step 6: Final answer
    x = 15,563.70

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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.