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Finding the Fourth Proportional to 3,126, 4,313.92 and 1,728.72

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Solution

The fourth proportional to 3,126, 4,313.92 and 1,728.72 is: 2,385.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,126 : 4,313.92 = 1,728.72 : x
  2. Step 2: Convert to fraction form
    3,126/4,313.92 = 1,728.72/x
  3. Step 3: Cross multiply
    3,126x = 4,313.92 × 1,728.72
  4. Step 4: Simplify right side
    3,126x = 7,457,559.78
  5. Step 5: Solve for x
    x = 7,457,559.78/3,126
  6. Step 6: Final answer
    x = 2,385.66

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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.