Home / 20,881.85-31,328.61-6,851.75

Finding the Fourth Proportional to 20,881.85, 31,328.61 and 6,851.75

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Solution

The fourth proportional to 20,881.85, 31,328.61 and 6,851.75 is: 10,279.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,881.85 : 31,328.61 = 6,851.75 : x
  2. Step 2: Convert to fraction form
    20,881.85/31,328.61 = 6,851.75/x
  3. Step 3: Cross multiply
    20,881.85x = 31,328.61 × 6,851.75
  4. Step 4: Simplify right side
    20,881.85x = 214,655,767.15
  5. Step 5: Solve for x
    x = 214,655,767.15/20,881.85
  6. Step 6: Final answer
    x = 10,279.54

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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.