Home / 21,215.85-29,269.92-13,145.82

Finding the Fourth Proportional to 21,215.85, 29,269.92 and 13,145.82

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Solution

The fourth proportional to 21,215.85, 29,269.92 and 13,145.82 is: 18,136.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,215.85 : 29,269.92 = 13,145.82 : x
  2. Step 2: Convert to fraction form
    21,215.85/29,269.92 = 13,145.82/x
  3. Step 3: Cross multiply
    21,215.85x = 29,269.92 × 13,145.82
  4. Step 4: Simplify right side
    21,215.85x = 384,777,099.73
  5. Step 5: Solve for x
    x = 384,777,099.73/21,215.85
  6. Step 6: Final answer
    x = 18,136.30

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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.