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Finding the Fourth Proportional to 7,681.80, 11,515.21 and 4,168.63

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Solution

The fourth proportional to 7,681.80, 11,515.21 and 4,168.63 is: 6,248.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,681.80 : 11,515.21 = 4,168.63 : x
  2. Step 2: Convert to fraction form
    7,681.80/11,515.21 = 4,168.63/x
  3. Step 3: Cross multiply
    7,681.80x = 11,515.21 × 4,168.63
  4. Step 4: Simplify right side
    7,681.80x = 48,002,649.86
  5. Step 5: Solve for x
    x = 48,002,649.86/7,681.80
  6. Step 6: Final answer
    x = 6,248.88

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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.