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Finding the Fourth Proportional to 12,807.90, 17,675.01 and 7,143.30

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Solution

The fourth proportional to 12,807.90, 17,675.01 and 7,143.30 is: 9,857.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,807.90 : 17,675.01 = 7,143.30 : x
  2. Step 2: Convert to fraction form
    12,807.90/17,675.01 = 7,143.30/x
  3. Step 3: Cross multiply
    12,807.90x = 17,675.01 × 7,143.30
  4. Step 4: Simplify right side
    12,807.90x = 126,257,898.93
  5. Step 5: Solve for x
    x = 126,257,898.93/12,807.90
  6. Step 6: Final answer
    x = 9,857.81

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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.