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Finding the Fourth Proportional to 12,675.69, 19,017.86 and 7,139.88

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Solution

The fourth proportional to 12,675.69, 19,017.86 and 7,139.88 is: 10,712.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,675.69 : 19,017.86 = 7,139.88 : x
  2. Step 2: Convert to fraction form
    12,675.69/19,017.86 = 7,139.88/x
  3. Step 3: Cross multiply
    12,675.69x = 19,017.86 × 7,139.88
  4. Step 4: Simplify right side
    12,675.69x = 135,785,202.56
  5. Step 5: Solve for x
    x = 135,785,202.56/12,675.69
  6. Step 6: Final answer
    x = 10,712.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.