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Finding the Fourth Proportional to 20,172.80, 30,259.20 and 19,046.40

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Solution

The fourth proportional to 20,172.80, 30,259.20 and 19,046.40 is: 28,569.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,172.80 : 30,259.20 = 19,046.40 : x
  2. Step 2: Convert to fraction form
    20,172.80/30,259.20 = 19,046.40/x
  3. Step 3: Cross multiply
    20,172.80x = 30,259.20 × 19,046.40
  4. Step 4: Simplify right side
    20,172.80x = 576,328,826.88
  5. Step 5: Solve for x
    x = 576,328,826.88/20,172.80
  6. Step 6: Final answer
    x = 28,569.60

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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.