Home / 20,920.68-31,381.01-6,129.59

Finding the Fourth Proportional to 20,920.68, 31,381.01 and 6,129.59

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Solution

The fourth proportional to 20,920.68, 31,381.01 and 6,129.59 is: 9,194.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.68 : 31,381.01 = 6,129.59 : x
  2. Step 2: Convert to fraction form
    20,920.68/31,381.01 = 6,129.59/x
  3. Step 3: Cross multiply
    20,920.68x = 31,381.01 × 6,129.59
  4. Step 4: Simplify right side
    20,920.68x = 192,352,830.36
  5. Step 5: Solve for x
    x = 192,352,830.36/20,920.68
  6. Step 6: Final answer
    x = 9,194.39

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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.