Home / 20,639.86-28,483.31-11,687.11

Finding the Fourth Proportional to 20,639.86, 28,483.31 and 11,687.11

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Solution

The fourth proportional to 20,639.86, 28,483.31 and 11,687.11 is: 16,128.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.86 : 28,483.31 = 11,687.11 : x
  2. Step 2: Convert to fraction form
    20,639.86/28,483.31 = 11,687.11/x
  3. Step 3: Cross multiply
    20,639.86x = 28,483.31 × 11,687.11
  4. Step 4: Simplify right side
    20,639.86x = 332,887,577.13
  5. Step 5: Solve for x
    x = 332,887,577.13/20,639.86
  6. Step 6: Final answer
    x = 16,128.38

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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.