Home / 20,931.62-28,887.64-11,977.34

Finding the Fourth Proportional to 20,931.62, 28,887.64 and 11,977.34

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Solution

The fourth proportional to 20,931.62, 28,887.64 and 11,977.34 is: 16,529.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.62 : 28,887.64 = 11,977.34 : x
  2. Step 2: Convert to fraction form
    20,931.62/28,887.64 = 11,977.34/x
  3. Step 3: Cross multiply
    20,931.62x = 28,887.64 × 11,977.34
  4. Step 4: Simplify right side
    20,931.62x = 345,996,911.70
  5. Step 5: Solve for x
    x = 345,996,911.70/20,931.62
  6. Step 6: Final answer
    x = 16,529.87

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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.