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Finding the Fourth Proportional to 12,963.39, 17,890.81 and 7,930.95

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Solution

The fourth proportional to 12,963.39, 17,890.81 and 7,930.95 is: 10,945.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,963.39 : 17,890.81 = 7,930.95 : x
  2. Step 2: Convert to fraction form
    12,963.39/17,890.81 = 7,930.95/x
  3. Step 3: Cross multiply
    12,963.39x = 17,890.81 × 7,930.95
  4. Step 4: Simplify right side
    12,963.39x = 141,891,174.21
  5. Step 5: Solve for x
    x = 141,891,174.21/12,963.39
  6. Step 6: Final answer
    x = 10,945.53

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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.