Home / 20,861.07-31,291.67-5,278.69

Finding the Fourth Proportional to 20,861.07, 31,291.67 and 5,278.69

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Solution

The fourth proportional to 20,861.07, 31,291.67 and 5,278.69 is: 7,918.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.07 : 31,291.67 = 5,278.69 : x
  2. Step 2: Convert to fraction form
    20,861.07/31,291.67 = 5,278.69/x
  3. Step 3: Cross multiply
    20,861.07x = 31,291.67 × 5,278.69
  4. Step 4: Simplify right side
    20,861.07x = 165,179,025.51
  5. Step 5: Solve for x
    x = 165,179,025.51/20,861.07
  6. Step 6: Final answer
    x = 7,918.05

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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.