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Finding the Fourth Proportional to 2,491.76, 3,736.39 and 931.50

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Solution

The fourth proportional to 2,491.76, 3,736.39 and 931.50 is: 1,396.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,491.76 : 3,736.39 = 931.50 : x
  2. Step 2: Convert to fraction form
    2,491.76/3,736.39 = 931.50/x
  3. Step 3: Cross multiply
    2,491.76x = 3,736.39 × 931.50
  4. Step 4: Simplify right side
    2,491.76x = 3,480,447.29
  5. Step 5: Solve for x
    x = 3,480,447.29/2,491.76
  6. Step 6: Final answer
    x = 1,396.78

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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.