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Finding the Fourth Proportional to 12,980.88, 17,919.40 and 9,995.60

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Solution

The fourth proportional to 12,980.88, 17,919.40 and 9,995.60 is: 13,798.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,980.88 : 17,919.40 = 9,995.60 : x
  2. Step 2: Convert to fraction form
    12,980.88/17,919.40 = 9,995.60/x
  3. Step 3: Cross multiply
    12,980.88x = 17,919.40 × 9,995.60
  4. Step 4: Simplify right side
    12,980.88x = 179,115,154.64
  5. Step 5: Solve for x
    x = 179,115,154.64/12,980.88
  6. Step 6: Final answer
    x = 13,798.38

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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.