Home / 20,791.12-31,186.70-8,316.72

Finding the Fourth Proportional to 20,791.12, 31,186.70 and 8,316.72

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Solution

The fourth proportional to 20,791.12, 31,186.70 and 8,316.72 is: 12,475.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,791.12 : 31,186.70 = 8,316.72 : x
  2. Step 2: Convert to fraction form
    20,791.12/31,186.70 = 8,316.72/x
  3. Step 3: Cross multiply
    20,791.12x = 31,186.70 × 8,316.72
  4. Step 4: Simplify right side
    20,791.12x = 259,371,051.62
  5. Step 5: Solve for x
    x = 259,371,051.62/20,791.12
  6. Step 6: Final answer
    x = 12,475.09

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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.