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Finding the Fourth Proportional to 1,992.18, 2,988.89 and 693.75

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Solution

The fourth proportional to 1,992.18, 2,988.89 and 693.75 is: 1,040.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,992.18 : 2,988.89 = 693.75 : x
  2. Step 2: Convert to fraction form
    1,992.18/2,988.89 = 693.75/x
  3. Step 3: Cross multiply
    1,992.18x = 2,988.89 × 693.75
  4. Step 4: Simplify right side
    1,992.18x = 2,073,538.97
  5. Step 5: Solve for x
    x = 2,073,538.97/1,992.18
  6. Step 6: Final answer
    x = 1,040.84

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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.