Home / 21,028.13-31,506.48-12,690.62

Finding the Fourth Proportional to 21,028.13, 31,506.48 and 12,690.62

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Solution

The fourth proportional to 21,028.13, 31,506.48 and 12,690.62 is: 19,014.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,028.13 : 31,506.48 = 12,690.62 : x
  2. Step 2: Convert to fraction form
    21,028.13/31,506.48 = 12,690.62/x
  3. Step 3: Cross multiply
    21,028.13x = 31,506.48 × 12,690.62
  4. Step 4: Simplify right side
    21,028.13x = 399,836,765.22
  5. Step 5: Solve for x
    x = 399,836,765.22/21,028.13
  6. Step 6: Final answer
    x = 19,014.38

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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.