Home / 20,660.10-28,511.15-11,228.66

Finding the Fourth Proportional to 20,660.10, 28,511.15 and 11,228.66

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Solution

The fourth proportional to 20,660.10, 28,511.15 and 11,228.66 is: 15,495.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,660.10 : 28,511.15 = 11,228.66 : x
  2. Step 2: Convert to fraction form
    20,660.10/28,511.15 = 11,228.66/x
  3. Step 3: Cross multiply
    20,660.10x = 28,511.15 × 11,228.66
  4. Step 4: Simplify right side
    20,660.10x = 320,142,009.56
  5. Step 5: Solve for x
    x = 320,142,009.56/20,660.10
  6. Step 6: Final answer
    x = 15,495.67

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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.