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Finding the Fourth Proportional to 12,720.40, 17,554.14 and 7,131.40

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Solution

The fourth proportional to 12,720.40, 17,554.14 and 7,131.40 is: 9,841.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720.40 : 17,554.14 = 7,131.40 : x
  2. Step 2: Convert to fraction form
    12,720.40/17,554.14 = 7,131.40/x
  3. Step 3: Cross multiply
    12,720.40x = 17,554.14 × 7,131.40
  4. Step 4: Simplify right side
    12,720.40x = 125,185,594.00
  5. Step 5: Solve for x
    x = 125,185,594.00/12,720.40
  6. Step 6: Final answer
    x = 9,841.33

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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.