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Finding the Fourth Proportional to 12,639.98, 17,443.05 and 6,974.78

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Solution

The fourth proportional to 12,639.98, 17,443.05 and 6,974.78 is: 9,625.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.98 : 17,443.05 = 6,974.78 : x
  2. Step 2: Convert to fraction form
    12,639.98/17,443.05 = 6,974.78/x
  3. Step 3: Cross multiply
    12,639.98x = 17,443.05 × 6,974.78
  4. Step 4: Simplify right side
    12,639.98x = 121,661,436.28
  5. Step 5: Solve for x
    x = 121,661,436.28/12,639.98
  6. Step 6: Final answer
    x = 9,625.13

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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.