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Finding the Fourth Proportional to 3,781.68, 5,217 and 2,455.80

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Solution

The fourth proportional to 3,781.68, 5,217 and 2,455.80 is: 3,387.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,781.68 : 5,217 = 2,455.80 : x
  2. Step 2: Convert to fraction form
    3,781.68/5,217 = 2,455.80/x
  3. Step 3: Cross multiply
    3,781.68x = 5,217 × 2,455.80
  4. Step 4: Simplify right side
    3,781.68x = 12,811,908.60
  5. Step 5: Solve for x
    x = 12,811,908.60/3,781.68
  6. Step 6: Final answer
    x = 3,387.89

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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.