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Finding the Fourth Proportional to 20,219.20, 28,365.20 and 20,219.20

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Solution

The fourth proportional to 20,219.20, 28,365.20 and 20,219.20 is: 28,365.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,219.20 : 28,365.20 = 20,219.20 : x
  2. Step 2: Convert to fraction form
    20,219.20/28,365.20 = 20,219.20/x
  3. Step 3: Cross multiply
    20,219.20x = 28,365.20 × 20,219.20
  4. Step 4: Simplify right side
    20,219.20x = 573,521,651.84
  5. Step 5: Solve for x
    x = 573,521,651.84/20,219.20
  6. Step 6: Final answer
    x = 28,365.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.