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Finding the Fourth Proportional to 20,120.40, 30,180.60 and 19,267.20

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Solution

The fourth proportional to 20,120.40, 30,180.60 and 19,267.20 is: 28,900.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,120.40 : 30,180.60 = 19,267.20 : x
  2. Step 2: Convert to fraction form
    20,120.40/30,180.60 = 19,267.20/x
  3. Step 3: Cross multiply
    20,120.40x = 30,180.60 × 19,267.20
  4. Step 4: Simplify right side
    20,120.40x = 581,495,656.32
  5. Step 5: Solve for x
    x = 581,495,656.32/20,120.40
  6. Step 6: Final answer
    x = 28,900.80

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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.