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Finding the Fourth Proportional to 12,807.15, 17,673.55 and 7,142.43

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Solution

The fourth proportional to 12,807.15, 17,673.55 and 7,142.43 is: 9,856.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,807.15 : 17,673.55 = 7,142.43 : x
  2. Step 2: Convert to fraction form
    12,807.15/17,673.55 = 7,142.43/x
  3. Step 3: Cross multiply
    12,807.15x = 17,673.55 × 7,142.43
  4. Step 4: Simplify right side
    12,807.15x = 126,232,093.73
  5. Step 5: Solve for x
    x = 126,232,093.73/12,807.15
  6. Step 6: Final answer
    x = 9,856.38

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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.