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Finding the Fourth Proportional to 13,139.70, 18,133.18 and 7,171.76

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Solution

The fourth proportional to 13,139.70, 18,133.18 and 7,171.76 is: 9,897.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.70 : 18,133.18 = 7,171.76 : x
  2. Step 2: Convert to fraction form
    13,139.70/18,133.18 = 7,171.76/x
  3. Step 3: Cross multiply
    13,139.70x = 18,133.18 × 7,171.76
  4. Step 4: Simplify right side
    13,139.70x = 130,046,815.00
  5. Step 5: Solve for x
    x = 130,046,815.00/13,139.70
  6. Step 6: Final answer
    x = 9,897.24

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.