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Finding the Fourth Proportional to 7,172.71, 9,898.46 and 3,986.30

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Solution

The fourth proportional to 7,172.71, 9,898.46 and 3,986.30 is: 5,501.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,172.71 : 9,898.46 = 3,986.30 : x
  2. Step 2: Convert to fraction form
    7,172.71/9,898.46 = 3,986.30/x
  3. Step 3: Cross multiply
    7,172.71x = 9,898.46 × 3,986.30
  4. Step 4: Simplify right side
    7,172.71x = 39,458,231.10
  5. Step 5: Solve for x
    x = 39,458,231.10/7,172.71
  6. Step 6: Final answer
    x = 5,501.16

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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.