Home / 20,886.18-31,358.44-13,887.78

Finding the Fourth Proportional to 20,886.18, 31,358.44 and 13,887.78

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Solution

The fourth proportional to 20,886.18, 31,358.44 and 13,887.78 is: 20,851.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,886.18 : 31,358.44 = 13,887.78 : x
  2. Step 2: Convert to fraction form
    20,886.18/31,358.44 = 13,887.78/x
  3. Step 3: Cross multiply
    20,886.18x = 31,358.44 × 13,887.78
  4. Step 4: Simplify right side
    20,886.18x = 435,499,115.86
  5. Step 5: Solve for x
    x = 435,499,115.86/20,886.18
  6. Step 6: Final answer
    x = 20,851.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.