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Finding the Fourth Proportional to 20,138.40, 30,207.60 and 19,285.20

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Solution

The fourth proportional to 20,138.40, 30,207.60 and 19,285.20 is: 28,927.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.40 : 30,207.60 = 19,285.20 : x
  2. Step 2: Convert to fraction form
    20,138.40/30,207.60 = 19,285.20/x
  3. Step 3: Cross multiply
    20,138.40x = 30,207.60 × 19,285.20
  4. Step 4: Simplify right side
    20,138.40x = 582,559,607.52
  5. Step 5: Solve for x
    x = 582,559,607.52/20,138.40
  6. Step 6: Final answer
    x = 28,927.80

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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.