Home / 20,421.12-28,178.40-12,036

Finding the Fourth Proportional to 20,421.12, 28,178.40 and 12,036

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Solution

The fourth proportional to 20,421.12, 28,178.40 and 12,036 is: 16,608.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,421.12 : 28,178.40 = 12,036 : x
  2. Step 2: Convert to fraction form
    20,421.12/28,178.40 = 12,036/x
  3. Step 3: Cross multiply
    20,421.12x = 28,178.40 × 12,036
  4. Step 4: Simplify right side
    20,421.12x = 339,155,222.40
  5. Step 5: Solve for x
    x = 339,155,222.40/20,421.12
  6. Step 6: Final answer
    x = 16,608.06

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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.