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Finding the Fourth Proportional to 1,991.38, 2,987.16 and 693.76

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Solution

The fourth proportional to 1,991.38, 2,987.16 and 693.76 is: 1,040.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.38 : 2,987.16 = 693.76 : x
  2. Step 2: Convert to fraction form
    1,991.38/2,987.16 = 693.76/x
  3. Step 3: Cross multiply
    1,991.38x = 2,987.16 × 693.76
  4. Step 4: Simplify right side
    1,991.38x = 2,072,372.12
  5. Step 5: Solve for x
    x = 2,072,372.12/1,991.38
  6. Step 6: Final answer
    x = 1,040.67

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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.