Home / 20,379.81-28,124.44-11,881.70

Finding the Fourth Proportional to 20,379.81, 28,124.44 and 11,881.70

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Solution

The fourth proportional to 20,379.81, 28,124.44 and 11,881.70 is: 16,396.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.81 : 28,124.44 = 11,881.70 : x
  2. Step 2: Convert to fraction form
    20,379.81/28,124.44 = 11,881.70/x
  3. Step 3: Cross multiply
    20,379.81x = 28,124.44 × 11,881.70
  4. Step 4: Simplify right side
    20,379.81x = 334,165,988.42
  5. Step 5: Solve for x
    x = 334,165,988.42/20,379.81
  6. Step 6: Final answer
    x = 16,396.91

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1.5x scale

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.