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Finding the Fourth Proportional to 9,138.70, 13,696.96 and 3,871.68

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Solution

The fourth proportional to 9,138.70, 13,696.96 and 3,871.68 is: 5,802.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,138.70 : 13,696.96 = 3,871.68 : x
  2. Step 2: Convert to fraction form
    9,138.70/13,696.96 = 3,871.68/x
  3. Step 3: Cross multiply
    9,138.70x = 13,696.96 × 3,871.68
  4. Step 4: Simplify right side
    9,138.70x = 53,030,246.09
  5. Step 5: Solve for x
    x = 53,030,246.09/9,138.70
  6. Step 6: Final answer
    x = 5,802.82

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1.5x scale

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.