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Finding the Fourth Proportional to 70,940.11, 106,410.55 and 21,020.64

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Solution

The fourth proportional to 70,940.11, 106,410.55 and 21,020.64 is: 31,531.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,940.11 : 106,410.55 = 21,020.64 : x
  2. Step 2: Convert to fraction form
    70,940.11/106,410.55 = 21,020.64/x
  3. Step 3: Cross multiply
    70,940.11x = 106,410.55 × 21,020.64
  4. Step 4: Simplify right side
    70,940.11x = 2,236,818,109.25
  5. Step 5: Solve for x
    x = 2,236,818,109.25/70,940.11
  6. Step 6: Final answer
    x = 31,531.08

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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.