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Finding the Fourth Proportional to 70,939.50, 106,410.87 and 21,018.66

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Solution

The fourth proportional to 70,939.50, 106,410.87 and 21,018.66 is: 31,528.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,939.50 : 106,410.87 = 21,018.66 : x
  2. Step 2: Convert to fraction form
    70,939.50/106,410.87 = 21,018.66/x
  3. Step 3: Cross multiply
    70,939.50x = 106,410.87 × 21,018.66
  4. Step 4: Simplify right side
    70,939.50x = 2,236,613,896.83
  5. Step 5: Solve for x
    x = 2,236,613,896.83/70,939.50
  6. Step 6: Final answer
    x = 31,528.47

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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.