Home / 8,619.60-12,931.20-2,780.22

Finding the Fourth Proportional to 8,619.60, 12,931.20 and 2,780.22

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Solution

The fourth proportional to 8,619.60, 12,931.20 and 2,780.22 is: 4,170.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,619.60 : 12,931.20 = 2,780.22 : x
  2. Step 2: Convert to fraction form
    8,619.60/12,931.20 = 2,780.22/x
  3. Step 3: Cross multiply
    8,619.60x = 12,931.20 × 2,780.22
  4. Step 4: Simplify right side
    8,619.60x = 35,951,580.86
  5. Step 5: Solve for x
    x = 35,951,580.86/8,619.60
  6. Step 6: Final answer
    x = 4,170.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.