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Finding the Fourth Proportional to 12,961.90, 17,870.92 and 9,940.51

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Solution

The fourth proportional to 12,961.90, 17,870.92 and 9,940.51 is: 13,705.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,961.90 : 17,870.92 = 9,940.51 : x
  2. Step 2: Convert to fraction form
    12,961.90/17,870.92 = 9,940.51/x
  3. Step 3: Cross multiply
    12,961.90x = 17,870.92 × 9,940.51
  4. Step 4: Simplify right side
    12,961.90x = 177,646,058.97
  5. Step 5: Solve for x
    x = 177,646,058.97/12,961.90
  6. Step 6: Final answer
    x = 13,705.25

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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.