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Finding the Fourth Proportional to 1,393.28, 2,090.82 and 663.68

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Solution

The fourth proportional to 1,393.28, 2,090.82 and 663.68 is: 995.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.28 : 2,090.82 = 663.68 : x
  2. Step 2: Convert to fraction form
    1,393.28/2,090.82 = 663.68/x
  3. Step 3: Cross multiply
    1,393.28x = 2,090.82 × 663.68
  4. Step 4: Simplify right side
    1,393.28x = 1,387,635.42
  5. Step 5: Solve for x
    x = 1,387,635.42/1,393.28
  6. Step 6: Final answer
    x = 995.95

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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.