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Finding the Fourth Proportional to 20,141.40, 30,212.10 and 19,120.80

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Solution

The fourth proportional to 20,141.40, 30,212.10 and 19,120.80 is: 28,681.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,141.40 : 30,212.10 = 19,120.80 : x
  2. Step 2: Convert to fraction form
    20,141.40/30,212.10 = 19,120.80/x
  3. Step 3: Cross multiply
    20,141.40x = 30,212.10 × 19,120.80
  4. Step 4: Simplify right side
    20,141.40x = 577,679,521.68
  5. Step 5: Solve for x
    x = 577,679,521.68/20,141.40
  6. Step 6: Final answer
    x = 28,681.20

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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.