Home / 20,911.20-28,856.16-11,477.76

Finding the Fourth Proportional to 20,911.20, 28,856.16 and 11,477.76

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Solution

The fourth proportional to 20,911.20, 28,856.16 and 11,477.76 is: 15,838.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.20 : 28,856.16 = 11,477.76 : x
  2. Step 2: Convert to fraction form
    20,911.20/28,856.16 = 11,477.76/x
  3. Step 3: Cross multiply
    20,911.20x = 28,856.16 × 11,477.76
  4. Step 4: Simplify right side
    20,911.20x = 331,204,079.00
  5. Step 5: Solve for x
    x = 331,204,079.00/20,911.20
  6. Step 6: Final answer
    x = 15,838.60

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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.