Home / 20,403.90-28,156.86-11,453.58

Finding the Fourth Proportional to 20,403.90, 28,156.86 and 11,453.58

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Solution

The fourth proportional to 20,403.90, 28,156.86 and 11,453.58 is: 15,805.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,403.90 : 28,156.86 = 11,453.58 : x
  2. Step 2: Convert to fraction form
    20,403.90/28,156.86 = 11,453.58/x
  3. Step 3: Cross multiply
    20,403.90x = 28,156.86 × 11,453.58
  4. Step 4: Simplify right side
    20,403.90x = 322,496,848.56
  5. Step 5: Solve for x
    x = 322,496,848.56/20,403.90
  6. Step 6: Final answer
    x = 15,805.65

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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.