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Finding the Fourth Proportional to 70,972.35, 106,440.37 and 21,040.78

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Solution

The fourth proportional to 70,972.35, 106,440.37 and 21,040.78 is: 31,555.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,972.35 : 106,440.37 = 21,040.78 : x
  2. Step 2: Convert to fraction form
    70,972.35/106,440.37 = 21,040.78/x
  3. Step 3: Cross multiply
    70,972.35x = 106,440.37 × 21,040.78
  4. Step 4: Simplify right side
    70,972.35x = 2,239,588,408.29
  5. Step 5: Solve for x
    x = 2,239,588,408.29/70,972.35
  6. Step 6: Final answer
    x = 31,555.79

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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.