Home / 20,888.66-31,348.55-8,408.78

Finding the Fourth Proportional to 20,888.66, 31,348.55 and 8,408.78

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Solution

The fourth proportional to 20,888.66, 31,348.55 and 8,408.78 is: 12,619.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,888.66 : 31,348.55 = 8,408.78 : x
  2. Step 2: Convert to fraction form
    20,888.66/31,348.55 = 8,408.78/x
  3. Step 3: Cross multiply
    20,888.66x = 31,348.55 × 8,408.78
  4. Step 4: Simplify right side
    20,888.66x = 263,602,861.48
  5. Step 5: Solve for x
    x = 263,602,861.48/20,888.66
  6. Step 6: Final answer
    x = 12,619.43

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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.