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Finding the Fourth Proportional to 70,958.71, 106,438.50 and 21,039.28

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Solution

The fourth proportional to 70,958.71, 106,438.50 and 21,039.28 is: 31,559.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,958.71 : 106,438.50 = 21,039.28 : x
  2. Step 2: Convert to fraction form
    70,958.71/106,438.50 = 21,039.28/x
  3. Step 3: Cross multiply
    70,958.71x = 106,438.50 × 21,039.28
  4. Step 4: Simplify right side
    70,958.71x = 2,239,389,404.28
  5. Step 5: Solve for x
    x = 2,239,389,404.28/70,958.71
  6. Step 6: Final answer
    x = 31,559.05

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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.