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Finding the Fourth Proportional to 12,419.73, 17,142.44 and 8,643.51

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Solution

The fourth proportional to 12,419.73, 17,142.44 and 8,643.51 is: 11,930.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,419.73 : 17,142.44 = 8,643.51 : x
  2. Step 2: Convert to fraction form
    12,419.73/17,142.44 = 8,643.51/x
  3. Step 3: Cross multiply
    12,419.73x = 17,142.44 × 8,643.51
  4. Step 4: Simplify right side
    12,419.73x = 148,170,808.35
  5. Step 5: Solve for x
    x = 148,170,808.35/12,419.73
  6. Step 6: Final answer
    x = 11,930.28

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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.