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Finding the Fourth Proportional to 71,551.20, 98,743.20 and 39,720.60

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Solution

The fourth proportional to 71,551.20, 98,743.20 and 39,720.60 is: 54,815.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,551.20 : 98,743.20 = 39,720.60 : x
  2. Step 2: Convert to fraction form
    71,551.20/98,743.20 = 39,720.60/x
  3. Step 3: Cross multiply
    71,551.20x = 98,743.20 × 39,720.60
  4. Step 4: Simplify right side
    71,551.20x = 3,922,139,149.92
  5. Step 5: Solve for x
    x = 3,922,139,149.92/71,551.20
  6. Step 6: Final answer
    x = 54,815.84

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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.