Home / 20,403.98-28,160.38-11,453.68

Finding the Fourth Proportional to 20,403.98, 28,160.38 and 11,453.68

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Solution

The fourth proportional to 20,403.98, 28,160.38 and 11,453.68 is: 15,807.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,403.98 : 28,160.38 = 11,453.68 : x
  2. Step 2: Convert to fraction form
    20,403.98/28,160.38 = 11,453.68/x
  3. Step 3: Cross multiply
    20,403.98x = 28,160.38 × 11,453.68
  4. Step 4: Simplify right side
    20,403.98x = 322,539,981.20
  5. Step 5: Solve for x
    x = 322,539,981.20/20,403.98
  6. Step 6: Final answer
    x = 15,807.70

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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.