Home / 20,560.78-28,374.06-11,129.50

Finding the Fourth Proportional to 20,560.78, 28,374.06 and 11,129.50

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Solution

The fourth proportional to 20,560.78, 28,374.06 and 11,129.50 is: 15,358.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,560.78 : 28,374.06 = 11,129.50 : x
  2. Step 2: Convert to fraction form
    20,560.78/28,374.06 = 11,129.50/x
  3. Step 3: Cross multiply
    20,560.78x = 28,374.06 × 11,129.50
  4. Step 4: Simplify right side
    20,560.78x = 315,789,100.77
  5. Step 5: Solve for x
    x = 315,789,100.77/20,560.78
  6. Step 6: Final answer
    x = 15,358.81

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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.