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Finding the Fourth Proportional to 12,813.80, 17,681.24 and 7,147.87

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Solution

The fourth proportional to 12,813.80, 17,681.24 and 7,147.87 is: 9,863.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,813.80 : 17,681.24 = 7,147.87 : x
  2. Step 2: Convert to fraction form
    12,813.80/17,681.24 = 7,147.87/x
  3. Step 3: Cross multiply
    12,813.80x = 17,681.24 × 7,147.87
  4. Step 4: Simplify right side
    12,813.80x = 126,383,178.63
  5. Step 5: Solve for x
    x = 126,383,178.63/12,813.80
  6. Step 6: Final answer
    x = 9,863.06

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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.