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Finding the Fourth Proportional to 1,331.11, 1,993.95 and 672.58

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Solution

The fourth proportional to 1,331.11, 1,993.95 and 672.58 is: 1,007.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.11 : 1,993.95 = 672.58 : x
  2. Step 2: Convert to fraction form
    1,331.11/1,993.95 = 672.58/x
  3. Step 3: Cross multiply
    1,331.11x = 1,993.95 × 672.58
  4. Step 4: Simplify right side
    1,331.11x = 1,341,090.89
  5. Step 5: Solve for x
    x = 1,341,090.89/1,331.11
  6. Step 6: Final answer
    x = 1,007.50

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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.