Home / 20,742.86-28,631.58-12,787.58

Finding the Fourth Proportional to 20,742.86, 28,631.58 and 12,787.58

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Solution

The fourth proportional to 20,742.86, 28,631.58 and 12,787.58 is: 17,650.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,742.86 : 28,631.58 = 12,787.58 : x
  2. Step 2: Convert to fraction form
    20,742.86/28,631.58 = 12,787.58/x
  3. Step 3: Cross multiply
    20,742.86x = 28,631.58 × 12,787.58
  4. Step 4: Simplify right side
    20,742.86x = 366,128,619.78
  5. Step 5: Solve for x
    x = 366,128,619.78/20,742.86
  6. Step 6: Final answer
    x = 17,650.83

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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.