Home / 20,587.20-28,410.98-13,421.73

Finding the Fourth Proportional to 20,587.20, 28,410.98 and 13,421.73

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Solution

The fourth proportional to 20,587.20, 28,410.98 and 13,421.73 is: 18,522.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,587.20 : 28,410.98 = 13,421.73 : x
  2. Step 2: Convert to fraction form
    20,587.20/28,410.98 = 13,421.73/x
  3. Step 3: Cross multiply
    20,587.20x = 28,410.98 × 13,421.73
  4. Step 4: Simplify right side
    20,587.20x = 381,324,502.60
  5. Step 5: Solve for x
    x = 381,324,502.60/20,587.20
  6. Step 6: Final answer
    x = 18,522.41

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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.