Home / 21,236.34-31,821.30-13,428.75

Finding the Fourth Proportional to 21,236.34, 31,821.30 and 13,428.75

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Solution

The fourth proportional to 21,236.34, 31,821.30 and 13,428.75 is: 20,122.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,236.34 : 31,821.30 = 13,428.75 : x
  2. Step 2: Convert to fraction form
    21,236.34/31,821.30 = 13,428.75/x
  3. Step 3: Cross multiply
    21,236.34x = 31,821.30 × 13,428.75
  4. Step 4: Simplify right side
    21,236.34x = 427,320,282.38
  5. Step 5: Solve for x
    x = 427,320,282.38/21,236.34
  6. Step 6: Final answer
    x = 20,122.12

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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.