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Finding the Fourth Proportional to 71,989.40, 107,971.79 and 19,386.58

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Solution

The fourth proportional to 71,989.40, 107,971.79 and 19,386.58 is: 29,076.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,989.40 : 107,971.79 = 19,386.58 : x
  2. Step 2: Convert to fraction form
    71,989.40/107,971.79 = 19,386.58/x
  3. Step 3: Cross multiply
    71,989.40x = 107,971.79 × 19,386.58
  4. Step 4: Simplify right side
    71,989.40x = 2,093,203,744.58
  5. Step 5: Solve for x
    x = 2,093,203,744.58/71,989.40
  6. Step 6: Final answer
    x = 29,076.55

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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.