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Finding the Fourth Proportional to 20,138.70, 30,150.45 and 19,562.70

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Solution

The fourth proportional to 20,138.70, 30,150.45 and 19,562.70 is: 29,288.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.70 : 30,150.45 = 19,562.70 : x
  2. Step 2: Convert to fraction form
    20,138.70/30,150.45 = 19,562.70/x
  3. Step 3: Cross multiply
    20,138.70x = 30,150.45 × 19,562.70
  4. Step 4: Simplify right side
    20,138.70x = 589,824,208.22
  5. Step 5: Solve for x
    x = 589,824,208.22/20,138.70
  6. Step 6: Final answer
    x = 29,288.10

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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.