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Finding the Fourth Proportional to 1,355.82, 2,034.90 and 663

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Solution

The fourth proportional to 1,355.82, 2,034.90 and 663 is: 995.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.82 : 2,034.90 = 663 : x
  2. Step 2: Convert to fraction form
    1,355.82/2,034.90 = 663/x
  3. Step 3: Cross multiply
    1,355.82x = 2,034.90 × 663
  4. Step 4: Simplify right side
    1,355.82x = 1,349,138.70
  5. Step 5: Solve for x
    x = 1,349,138.70/1,355.82
  6. Step 6: Final answer
    x = 995.07

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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.