Home / 12,987.22-17,917.44-7,947.40

Finding the Fourth Proportional to 12,987.22, 17,917.44 and 7,947.40

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Solution

The fourth proportional to 12,987.22, 17,917.44 and 7,947.40 is: 10,964.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.22 : 17,917.44 = 7,947.40 : x
  2. Step 2: Convert to fraction form
    12,987.22/17,917.44 = 7,947.40/x
  3. Step 3: Cross multiply
    12,987.22x = 17,917.44 × 7,947.40
  4. Step 4: Simplify right side
    12,987.22x = 142,397,062.66
  5. Step 5: Solve for x
    x = 142,397,062.66/12,987.22
  6. Step 6: Final answer
    x = 10,964.40

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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.