Home / 12,891.72-17,784.54-8,918.36

Finding the Fourth Proportional to 12,891.72, 17,784.54 and 8,918.36

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Solution

The fourth proportional to 12,891.72, 17,784.54 and 8,918.36 is: 12,303.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.72 : 17,784.54 = 8,918.36 : x
  2. Step 2: Convert to fraction form
    12,891.72/17,784.54 = 8,918.36/x
  3. Step 3: Cross multiply
    12,891.72x = 17,784.54 × 8,918.36
  4. Step 4: Simplify right side
    12,891.72x = 158,608,930.15
  5. Step 5: Solve for x
    x = 158,608,930.15/12,891.72
  6. Step 6: Final answer
    x = 12,303.16

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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.