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Finding the Fourth Proportional to 12,808.10, 17,675.25 and 7,143.20

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Solution

The fourth proportional to 12,808.10, 17,675.25 and 7,143.20 is: 9,857.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,808.10 : 17,675.25 = 7,143.20 : x
  2. Step 2: Convert to fraction form
    12,808.10/17,675.25 = 7,143.20/x
  3. Step 3: Cross multiply
    12,808.10x = 17,675.25 × 7,143.20
  4. Step 4: Simplify right side
    12,808.10x = 126,257,810.08
  5. Step 5: Solve for x
    x = 126,257,810.08/12,808.10
  6. Step 6: Final answer
    x = 9,857.66

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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.