Home / 20,638.32-28,482.64-11,687.40

Finding the Fourth Proportional to 20,638.32, 28,482.64 and 11,687.40

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Solution

The fourth proportional to 20,638.32, 28,482.64 and 11,687.40 is: 16,129.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.32 : 28,482.64 = 11,687.40 : x
  2. Step 2: Convert to fraction form
    20,638.32/28,482.64 = 11,687.40/x
  3. Step 3: Cross multiply
    20,638.32x = 28,482.64 × 11,687.40
  4. Step 4: Simplify right side
    20,638.32x = 332,888,006.74
  5. Step 5: Solve for x
    x = 332,888,006.74/20,638.32
  6. Step 6: Final answer
    x = 16,129.61

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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.