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Finding the Fourth Proportional to 20,408.40, 30,612.60 and 10,040.40

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Solution

The fourth proportional to 20,408.40, 30,612.60 and 10,040.40 is: 15,060.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,408.40 : 30,612.60 = 10,040.40 : x
  2. Step 2: Convert to fraction form
    20,408.40/30,612.60 = 10,040.40/x
  3. Step 3: Cross multiply
    20,408.40x = 30,612.60 × 10,040.40
  4. Step 4: Simplify right side
    20,408.40x = 307,362,749.04
  5. Step 5: Solve for x
    x = 307,362,749.04/20,408.40
  6. Step 6: Final answer
    x = 15,060.60

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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.