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Finding the Fourth Proportional to 70,939.55, 106,424.90 and 21,023.56

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Solution

The fourth proportional to 70,939.55, 106,424.90 and 21,023.56 is: 31,539.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,939.55 : 106,424.90 = 21,023.56 : x
  2. Step 2: Convert to fraction form
    70,939.55/106,424.90 = 21,023.56/x
  3. Step 3: Cross multiply
    70,939.55x = 106,424.90 × 21,023.56
  4. Step 4: Simplify right side
    70,939.55x = 2,237,430,377.40
  5. Step 5: Solve for x
    x = 2,237,430,377.40/70,939.55
  6. Step 6: Final answer
    x = 31,539.96

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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.