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Finding the Fourth Proportional to 1,181.80, 1,630.50 and 739.88

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Solution

The fourth proportional to 1,181.80, 1,630.50 and 739.88 is: 1,020.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.80 : 1,630.50 = 739.88 : x
  2. Step 2: Convert to fraction form
    1,181.80/1,630.50 = 739.88/x
  3. Step 3: Cross multiply
    1,181.80x = 1,630.50 × 739.88
  4. Step 4: Simplify right side
    1,181.80x = 1,206,374.34
  5. Step 5: Solve for x
    x = 1,206,374.34/1,181.80
  6. Step 6: Final answer
    x = 1,020.79

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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.