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Finding the Fourth Proportional to 12,808.88, 17,676.60 and 7,221.20

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Solution

The fourth proportional to 12,808.88, 17,676.60 and 7,221.20 is: 9,965.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,808.88 : 17,676.60 = 7,221.20 : x
  2. Step 2: Convert to fraction form
    12,808.88/17,676.60 = 7,221.20/x
  3. Step 3: Cross multiply
    12,808.88x = 17,676.60 × 7,221.20
  4. Step 4: Simplify right side
    12,808.88x = 127,646,263.92
  5. Step 5: Solve for x
    x = 127,646,263.92/12,808.88
  6. Step 6: Final answer
    x = 9,965.45

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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.