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Finding the Fourth Proportional to 2,657.86, 3,987 and 809.12

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Solution

The fourth proportional to 2,657.86, 3,987 and 809.12 is: 1,213.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,657.86 : 3,987 = 809.12 : x
  2. Step 2: Convert to fraction form
    2,657.86/3,987 = 809.12/x
  3. Step 3: Cross multiply
    2,657.86x = 3,987 × 809.12
  4. Step 4: Simplify right side
    2,657.86x = 3,225,961.44
  5. Step 5: Solve for x
    x = 3,225,961.44/2,657.86
  6. Step 6: Final answer
    x = 1,213.74

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1.5x scale

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.