Home / 21,861.62-30,171.80-12,428.36

Finding the Fourth Proportional to 21,861.62, 30,171.80 and 12,428.36

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Solution

The fourth proportional to 21,861.62, 30,171.80 and 12,428.36 is: 17,152.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,861.62 : 30,171.80 = 12,428.36 : x
  2. Step 2: Convert to fraction form
    21,861.62/30,171.80 = 12,428.36/x
  3. Step 3: Cross multiply
    21,861.62x = 30,171.80 × 12,428.36
  4. Step 4: Simplify right side
    21,861.62x = 374,985,930.11
  5. Step 5: Solve for x
    x = 374,985,930.11/21,861.62
  6. Step 6: Final answer
    x = 17,152.71

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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.