Home / 20,379.89-28,123.67-12,419.21

Finding the Fourth Proportional to 20,379.89, 28,123.67 and 12,419.21

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Solution

The fourth proportional to 20,379.89, 28,123.67 and 12,419.21 is: 17,138.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.89 : 28,123.67 = 12,419.21 : x
  2. Step 2: Convert to fraction form
    20,379.89/28,123.67 = 12,419.21/x
  3. Step 3: Cross multiply
    20,379.89x = 28,123.67 × 12,419.21
  4. Step 4: Simplify right side
    20,379.89x = 349,273,701.60
  5. Step 5: Solve for x
    x = 349,273,701.60/20,379.89
  6. Step 6: Final answer
    x = 17,138.15

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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.