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Finding the Fourth Proportional to 12,645.80, 17,451.21 and 6,980.55

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Solution

The fourth proportional to 12,645.80, 17,451.21 and 6,980.55 is: 9,633.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,645.80 : 17,451.21 = 6,980.55 : x
  2. Step 2: Convert to fraction form
    12,645.80/17,451.21 = 6,980.55/x
  3. Step 3: Cross multiply
    12,645.80x = 17,451.21 × 6,980.55
  4. Step 4: Simplify right side
    12,645.80x = 121,819,043.97
  5. Step 5: Solve for x
    x = 121,819,043.97/12,645.80
  6. Step 6: Final answer
    x = 9,633.16

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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.