Home / 20,926.80-31,325.40-12,135.60

Finding the Fourth Proportional to 20,926.80, 31,325.40 and 12,135.60

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Solution

The fourth proportional to 20,926.80, 31,325.40 and 12,135.60 is: 18,165.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,926.80 : 31,325.40 = 12,135.60 : x
  2. Step 2: Convert to fraction form
    20,926.80/31,325.40 = 12,135.60/x
  3. Step 3: Cross multiply
    20,926.80x = 31,325.40 × 12,135.60
  4. Step 4: Simplify right side
    20,926.80x = 380,152,524.24
  5. Step 5: Solve for x
    x = 380,152,524.24/20,926.80
  6. Step 6: Final answer
    x = 18,165.82

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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.