Home / 21,709.40-29,954.12-13,215.96

Finding the Fourth Proportional to 21,709.40, 29,954.12 and 13,215.96

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Solution

The fourth proportional to 21,709.40, 29,954.12 and 13,215.96 is: 18,235.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,709.40 : 29,954.12 = 13,215.96 : x
  2. Step 2: Convert to fraction form
    21,709.40/29,954.12 = 13,215.96/x
  3. Step 3: Cross multiply
    21,709.40x = 29,954.12 × 13,215.96
  4. Step 4: Simplify right side
    21,709.40x = 395,872,385.68
  5. Step 5: Solve for x
    x = 395,872,385.68/21,709.40
  6. Step 6: Final answer
    x = 18,235.07

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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.