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Finding the Fourth Proportional to 71,688.87, 98,931.11 and 39,858.03

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Solution

The fourth proportional to 71,688.87, 98,931.11 and 39,858.03 is: 55,004.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,688.87 : 98,931.11 = 39,858.03 : x
  2. Step 2: Convert to fraction form
    71,688.87/98,931.11 = 39,858.03/x
  3. Step 3: Cross multiply
    71,688.87x = 98,931.11 × 39,858.03
  4. Step 4: Simplify right side
    71,688.87x = 3,943,198,951.02
  5. Step 5: Solve for x
    x = 3,943,198,951.02/71,688.87
  6. Step 6: Final answer
    x = 55,004.34

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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.