Home / 20,818.40-28,729.60-11,387.36

Finding the Fourth Proportional to 20,818.40, 28,729.60 and 11,387.36

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Solution

The fourth proportional to 20,818.40, 28,729.60 and 11,387.36 is: 15,714.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.40 : 28,729.60 = 11,387.36 : x
  2. Step 2: Convert to fraction form
    20,818.40/28,729.60 = 11,387.36/x
  3. Step 3: Cross multiply
    20,818.40x = 28,729.60 × 11,387.36
  4. Step 4: Simplify right side
    20,818.40x = 327,154,297.86
  5. Step 5: Solve for x
    x = 327,154,297.86/20,818.40
  6. Step 6: Final answer
    x = 15,714.67

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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.