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Finding the Fourth Proportional to 40,491.70, 55,917.03 and 31,043.86

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Solution

The fourth proportional to 40,491.70, 55,917.03 and 31,043.86 is: 42,870.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,491.70 : 55,917.03 = 31,043.86 : x
  2. Step 2: Convert to fraction form
    40,491.70/55,917.03 = 31,043.86/x
  3. Step 3: Cross multiply
    40,491.70x = 55,917.03 × 31,043.86
  4. Step 4: Simplify right side
    40,491.70x = 1,735,880,427.56
  5. Step 5: Solve for x
    x = 1,735,880,427.56/40,491.70
  6. Step 6: Final answer
    x = 42,870.03

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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.