Home / 12,987.12-17,921.12-7,949.18

Finding the Fourth Proportional to 12,987.12, 17,921.12 and 7,949.18

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Solution

The fourth proportional to 12,987.12, 17,921.12 and 7,949.18 is: 10,969.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.12 : 17,921.12 = 7,949.18 : x
  2. Step 2: Convert to fraction form
    12,987.12/17,921.12 = 7,949.18/x
  3. Step 3: Cross multiply
    12,987.12x = 17,921.12 × 7,949.18
  4. Step 4: Simplify right side
    12,987.12x = 142,458,208.68
  5. Step 5: Solve for x
    x = 142,458,208.68/12,987.12
  6. Step 6: Final answer
    x = 10,969.19

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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.