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Finding the Fourth Proportional to 7,172.81, 9,898.15 and 3,986.33

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Solution

The fourth proportional to 7,172.81, 9,898.15 and 3,986.33 is: 5,500.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,172.81 : 9,898.15 = 3,986.33 : x
  2. Step 2: Convert to fraction form
    7,172.81/9,898.15 = 3,986.33/x
  3. Step 3: Cross multiply
    7,172.81x = 9,898.15 × 3,986.33
  4. Step 4: Simplify right side
    7,172.81x = 39,457,292.29
  5. Step 5: Solve for x
    x = 39,457,292.29/7,172.81
  6. Step 6: Final answer
    x = 5,500.95

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1.5x scale

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.