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Finding the Fourth Proportional to 71,539.36, 98,724.60 and 39,708.28

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Solution

The fourth proportional to 71,539.36, 98,724.60 and 39,708.28 is: 54,797.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,539.36 : 98,724.60 = 39,708.28 : x
  2. Step 2: Convert to fraction form
    71,539.36/98,724.60 = 39,708.28/x
  3. Step 3: Cross multiply
    71,539.36x = 98,724.60 × 39,708.28
  4. Step 4: Simplify right side
    71,539.36x = 3,920,184,059.69
  5. Step 5: Solve for x
    x = 3,920,184,059.69/71,539.36
  6. Step 6: Final answer
    x = 54,797.58

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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.