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Finding the Fourth Proportional to 12,756.34, 17,604.95 and 7,721.81

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Solution

The fourth proportional to 12,756.34, 17,604.95 and 7,721.81 is: 10,656.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,756.34 : 17,604.95 = 7,721.81 : x
  2. Step 2: Convert to fraction form
    12,756.34/17,604.95 = 7,721.81/x
  3. Step 3: Cross multiply
    12,756.34x = 17,604.95 × 7,721.81
  4. Step 4: Simplify right side
    12,756.34x = 135,942,040.35
  5. Step 5: Solve for x
    x = 135,942,040.35/12,756.34
  6. Step 6: Final answer
    x = 10,656.83

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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.