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Finding the Fourth Proportional to 19,995.12, 30,012.90 and 11,691

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Solution

The fourth proportional to 19,995.12, 30,012.90 and 11,691 is: 17,548.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,995.12 : 30,012.90 = 11,691 : x
  2. Step 2: Convert to fraction form
    19,995.12/30,012.90 = 11,691/x
  3. Step 3: Cross multiply
    19,995.12x = 30,012.90 × 11,691
  4. Step 4: Simplify right side
    19,995.12x = 350,880,813.90
  5. Step 5: Solve for x
    x = 350,880,813.90/19,995.12
  6. Step 6: Final answer
    x = 17,548.32

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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.