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Finding the Fourth Proportional to 71,851.79, 99,163.28 and 39,589.74

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Solution

The fourth proportional to 71,851.79, 99,163.28 and 39,589.74 is: 54,638.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,851.79 : 99,163.28 = 39,589.74 : x
  2. Step 2: Convert to fraction form
    71,851.79/99,163.28 = 39,589.74/x
  3. Step 3: Cross multiply
    71,851.79x = 99,163.28 × 39,589.74
  4. Step 4: Simplify right side
    71,851.79x = 3,925,848,181.48
  5. Step 5: Solve for x
    x = 3,925,848,181.48/71,851.79
  6. Step 6: Final answer
    x = 54,638.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.