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Finding the Fourth Proportional to 70,851.60, 106,288.86 and 20,936.70

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Solution

The fourth proportional to 70,851.60, 106,288.86 and 20,936.70 is: 31,408.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,851.60 : 106,288.86 = 20,936.70 : x
  2. Step 2: Convert to fraction form
    70,851.60/106,288.86 = 20,936.70/x
  3. Step 3: Cross multiply
    70,851.60x = 106,288.86 × 20,936.70
  4. Step 4: Simplify right side
    70,851.60x = 2,225,337,975.16
  5. Step 5: Solve for x
    x = 2,225,337,975.16/70,851.60
  6. Step 6: Final answer
    x = 31,408.44

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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.