Home / 20,308.66-28,031.91-11,812.78

Finding the Fourth Proportional to 20,308.66, 28,031.91 and 11,812.78

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Solution

The fourth proportional to 20,308.66, 28,031.91 and 11,812.78 is: 16,305.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,308.66 : 28,031.91 = 11,812.78 : x
  2. Step 2: Convert to fraction form
    20,308.66/28,031.91 = 11,812.78/x
  3. Step 3: Cross multiply
    20,308.66x = 28,031.91 × 11,812.78
  4. Step 4: Simplify right side
    20,308.66x = 331,134,785.81
  5. Step 5: Solve for x
    x = 331,134,785.81/20,308.66
  6. Step 6: Final answer
    x = 16,305.10

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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.