Home / 20,515.36-28,430.11-20,121.64

Finding the Fourth Proportional to 20,515.36, 28,430.11 and 20,121.64

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Solution

The fourth proportional to 20,515.36, 28,430.11 and 20,121.64 is: 27,884.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,515.36 : 28,430.11 = 20,121.64 : x
  2. Step 2: Convert to fraction form
    20,515.36/28,430.11 = 20,121.64/x
  3. Step 3: Cross multiply
    20,515.36x = 28,430.11 × 20,121.64
  4. Step 4: Simplify right side
    20,515.36x = 572,060,438.58
  5. Step 5: Solve for x
    x = 572,060,438.58/20,515.36
  6. Step 6: Final answer
    x = 27,884.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.