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Finding the Fourth Proportional to 6,319.86, 8,721.90 and 3,487.80

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Solution

The fourth proportional to 6,319.86, 8,721.90 and 3,487.80 is: 4,813.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,319.86 : 8,721.90 = 3,487.80 : x
  2. Step 2: Convert to fraction form
    6,319.86/8,721.90 = 3,487.80/x
  3. Step 3: Cross multiply
    6,319.86x = 8,721.90 × 3,487.80
  4. Step 4: Simplify right side
    6,319.86x = 30,420,242.82
  5. Step 5: Solve for x
    x = 30,420,242.82/6,319.86
  6. Step 6: Final answer
    x = 4,813.44

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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.