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Finding the Fourth Proportional to 7,172, 9,897.36 and 4,028.12

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Solution

The fourth proportional to 7,172, 9,897.36 and 4,028.12 is: 5,558.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,172 : 9,897.36 = 4,028.12 : x
  2. Step 2: Convert to fraction form
    7,172/9,897.36 = 4,028.12/x
  3. Step 3: Cross multiply
    7,172x = 9,897.36 × 4,028.12
  4. Step 4: Simplify right side
    7,172x = 39,867,753.76
  5. Step 5: Solve for x
    x = 39,867,753.76/7,172
  6. Step 6: Final answer
    x = 5,558.81

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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.