Home / 21,239.34-31,825.80-13,431.75

Finding the Fourth Proportional to 21,239.34, 31,825.80 and 13,431.75

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Solution

The fourth proportional to 21,239.34, 31,825.80 and 13,431.75 is: 20,126.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,239.34 : 31,825.80 = 13,431.75 : x
  2. Step 2: Convert to fraction form
    21,239.34/31,825.80 = 13,431.75/x
  3. Step 3: Cross multiply
    21,239.34x = 31,825.80 × 13,431.75
  4. Step 4: Simplify right side
    21,239.34x = 427,476,189.15
  5. Step 5: Solve for x
    x = 427,476,189.15/21,239.34
  6. Step 6: Final answer
    x = 20,126.62

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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.