Home / 20,645.31-28,490.43-11,213.85

Finding the Fourth Proportional to 20,645.31, 28,490.43 and 11,213.85

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Solution

The fourth proportional to 20,645.31, 28,490.43 and 11,213.85 is: 15,475.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,645.31 : 28,490.43 = 11,213.85 : x
  2. Step 2: Convert to fraction form
    20,645.31/28,490.43 = 11,213.85/x
  3. Step 3: Cross multiply
    20,645.31x = 28,490.43 × 11,213.85
  4. Step 4: Simplify right side
    20,645.31x = 319,487,408.46
  5. Step 5: Solve for x
    x = 319,487,408.46/20,645.31
  6. Step 6: Final answer
    x = 15,475.06

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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.